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先清空旧数据，保证大家的结果和本文一致\n",[1597,1726,1727,1729,1731,1733,1735,1738,1741,1744],{"class":1599,"line":1645},[1597,1728,1604],{"class":1603},[1597,1730,1608],{"class":1607},[1597,1732,1611],{"class":1603},[1597,1734,1608],{"class":1607},[1597,1736,1737],{"class":1616},"deleteMany",[1597,1739,1740],{"class":1603},"(",[1597,1742,1743],{"class":1607},"{}",[1597,1745,1746],{"class":1603},")\n",[1597,1748,1750],{"class":1599,"line":1749},5,[1597,1751,1718],{"emptyLinePlaceholder":1717},[1597,1753,1755,1757,1759,1761,1763,1766],{"class":1599,"line":1754},6,[1597,1756,1604],{"class":1603},[1597,1758,1608],{"class":1607},[1597,1760,1611],{"class":1603},[1597,1762,1608],{"class":1607},[1597,1764,1765],{"class":1616},"insertMany",[1597,1767,1620],{"class":1603},[1597,1769,1771,1773,1777,1780,1783,1786,1789,1792,1795,1797,1800,1802,1805,1807,1809,1812,1814],{"class":1599,"line":1770},7,[1597,1772,1626],{"class":1607},[1597,1774,1776],{"class":1775},"sd2Uz"," username",[1597,1778,1779],{"class":1607},":",[1597,1781,1782],{"class":1607}," '",[1597,1784,1785],{"class":1673},"小明",[1597,1787,1788],{"class":1607},"'",[1597,1790,1791],{"class":1607},",",[1597,1793,1794],{"class":1775}," age",[1597,1796,1779],{"class":1607},[1597,1798,1799],{"class":1695}," 20",[1597,1801,1791],{"class":1607},[1597,1803,1804],{"class":1775}," city",[1597,1806,1779],{"class":1607},[1597,1808,1782],{"class":1607},[1597,1810,1811],{"class":1673},"北京",[1597,1813,1788],{"class":1607},[1597,1815,1816],{"class":1607}," },\n",[1597,1818,1820,1822,1824,1826,1828,1831,1833,1835,1837,1839,1842,1844,1846,1848,1850,1853,1855],{"class":1599,"line":1819},8,[1597,1821,1626],{"class":1607},[1597,1823,1776],{"class":1775},[1597,1825,1779],{"class":1607},[1597,1827,1782],{"class":1607},[1597,1829,1830],{"class":1673},"小红",[1597,1832,1788],{"class":1607},[1597,1834,1791],{"class":1607},[1597,1836,1794],{"class":1775},[1597,1838,1779],{"class":1607},[1597,1840,1841],{"class":1695}," 25",[1597,1843,1791],{"class":1607},[1597,1845,1804],{"class":1775},[1597,1847,1779],{"class":1607},[1597,1849,1782],{"class":1607},[1597,1851,1852],{"class":1673},"上海",[1597,1854,1788],{"class":1607},[1597,1856,1816],{"class":1607},[1597,1858,1860,1862,1864,1866,1868,1871,1873,1875,1877,1879,1882,1884,1886,1888,1890,1893,1895],{"class":1599,"line":1859},9,[1597,1861,1626],{"class":1607},[1597,1863,1776],{"class":1775},[1597,1865,1779],{"class":1607},[1597,1867,1782],{"class":1607},[1597,1869,1870],{"class":1673},"小刚",[1597,1872,1788],{"class":1607},[1597,1874,1791],{"class":1607},[1597,1876,1794],{"class":1775},[1597,1878,1779],{"class":1607},[1597,1880,1881],{"class":1695}," 30",[1597,1883,1791],{"class":1607},[1597,1885,1804],{"class":1775},[1597,1887,1779],{"class":1607},[1597,1889,1782],{"class":1607},[1597,1891,1892],{"class":1673},"广州",[1597,1894,1788],{"class":1607},[1597,1896,1816],{"class":1607},[1597,1898,1900,1902,1904,1906,1908,1911,1913,1915,1917,1919,1922,1924,1926,1928,1930,1932,1934],{"class":1599,"line":1899},10,[1597,1901,1626],{"class":1607},[1597,1903,1776],{"class":1775},[1597,1905,1779],{"class":1607},[1597,1907,1782],{"class":1607},[1597,1909,1910],{"class":1673},"小丽",[1597,1912,1788],{"class":1607},[1597,1914,1791],{"class":1607},[1597,1916,1794],{"class":1775},[1597,1918,1779],{"class":1607},[1597,1920,1921],{"class":1695}," 28",[1597,1923,1791],{"class":1607},[1597,1925,1804],{"class":1775},[1597,1927,1779],{"class":1607},[1597,1929,1782],{"class":1607},[1597,1931,1811],{"class":1673},[1597,1933,1788],{"class":1607},[1597,1935,1816],{"class":1607},[1597,1937,1939,1941,1943,1945,1947,1950,1952,1954,1956,1958,1961,1963,1965,1967,1969,1971,1973],{"class":1599,"line":1938},11,[1597,1940,1626],{"class":1607},[1597,1942,1776],{"class":1775},[1597,1944,1779],{"class":1607},[1597,1946,1782],{"class":1607},[1597,1948,1949],{"class":1673},"周七",[1597,1951,1788],{"class":1607},[1597,1953,1791],{"class":1607},[1597,1955,1794],{"class":1775},[1597,1957,1779],{"class":1607},[1597,1959,1960],{"class":1695}," 26",[1597,1962,1791],{"class":1607},[1597,1964,1804],{"class":1775},[1597,1966,1779],{"class":1607},[1597,1968,1782],{"class":1607},[1597,1970,1811],{"class":1673},[1597,1972,1788],{"class":1607},[1597,1974,1816],{"class":1607},[1597,1976,1978,1980,1982,1984,1986,1989,1991,1993,1995,1997,2000,2002,2004,2006,2008,2010,2012],{"class":1599,"line":1977},12,[1597,1979,1626],{"class":1607},[1597,1981,1776],{"class":1775},[1597,1983,1779],{"class":1607},[1597,1985,1782],{"class":1607},[1597,1987,1988],{"class":1673},"吴八",[1597,1990,1788],{"class":1607},[1597,1992,1791],{"class":1607},[1597,1994,1794],{"class":1775},[1597,1996,1779],{"class":1607},[1597,1998,1999],{"class":1695}," 24",[1597,2001,1791],{"class":1607},[1597,2003,1804],{"class":1775},[1597,2005,1779],{"class":1607},[1597,2007,1782],{"class":1607},[1597,2009,1852],{"class":1673},[1597,2011,1788],{"class":1607},[1597,2013,1816],{"class":1607},[1597,2015,2017,2019],{"class":1599,"line":2016},13,[1597,2018,1648],{"class":1603},[1597,2020,1651],{"class":1607},[2022,2023,2024],"tip",{},[1531,2025,2026,2027,2030,2031,2034,2035,2038],{},"本文基于 ",[1540,2028,2029],{},"MongoDB 8.0","（Docker 镜像 ",[1535,2032,2033],{},"mongo:8","）编写和验证。",[1535,2036,2037],{},"deleteMany({})"," 会清空整个集合，如果你之前有想保留的数据，跳过这一步即可，只是统计结果会和本文略有差异。",[1565,2040],{},[1526,2042,2044],{"id":2043},"match-与-group","✨ $match 与 $group",[1531,2046,2047,2048,2050,2051,2053],{},"聚合管道里阶段有很多，我们先掌握两个常用的：",[1535,2049,1552],{}," 和 ",[1535,2052,1556],{},"。",[1531,2055,2056,2059,2060,2062],{},[1540,2057,2058],{},"$match 负责过滤","，把不满足条件的文档挡在门外。它的条件写法和 ",[1535,2061,1537],{}," 完全一样，比如只看北京的用户：",[1588,2064,2066],{"className":1590,"code":2065,"language":1592,"meta":1593,"style":1593},"db.user.aggregate([\n    { $match: { city: '北京' } },\n]);\n",[1535,2067,2068,2082,2109],{"__ignoreMap":1593},[1597,2069,2070,2072,2074,2076,2078,2080],{"class":1599,"line":1600},[1597,2071,1604],{"class":1603},[1597,2073,1608],{"class":1607},[1597,2075,1611],{"class":1603},[1597,2077,1608],{"class":1607},[1597,2079,1617],{"class":1616},[1597,2081,1620],{"class":1603},[1597,2083,2084,2086,2089,2091,2094,2096,2098,2100,2102,2104,2107],{"class":1599,"line":1623},[1597,2085,1626],{"class":1607},[1597,2087,2088],{"class":1775}," $match",[1597,2090,1779],{"class":1607},[1597,2092,2093],{"class":1607}," {",[1597,2095,1804],{"class":1775},[1597,2097,1779],{"class":1607},[1597,2099,1782],{"class":1607},[1597,2101,1811],{"class":1673},[1597,2103,1788],{"class":1607},[1597,2105,2106],{"class":1607}," }",[1597,2108,1816],{"class":1607},[1597,2110,2111,2113],{"class":1599,"line":1635},[1597,2112,1648],{"class":1603},[1597,2114,1651],{"class":1607},[1531,2116,2117,2118,2121,2122,2124,2125,2127],{},"结果和 ",[1535,2119,2120],{},"db.user.find({ city: '北京' })"," 一样，能查出小明、小丽、周七三条数据。那为什么不直接用 ",[1535,2123,1537],{}," 呢？因为 ",[1535,2126,1552],{}," 通常只是流水线的工序之一，后面还要接着加工。",[1531,2129,2130,2133],{},[1540,2131,2132],{},"$group 负责分组统计","，这是聚合管道的核心。比如按城市统计人数：",[1588,2135,2137],{"className":1590,"code":2136,"language":1592,"meta":1593,"style":1593},"db.user.aggregate([\n    {\n        $group: {\n            _id: '$city',\n            count: { $sum: 1 },\n        },\n    },\n]);\n",[1535,2138,2139,2153,2158,2168,2185,2204,2209,2214],{"__ignoreMap":1593},[1597,2140,2141,2143,2145,2147,2149,2151],{"class":1599,"line":1600},[1597,2142,1604],{"class":1603},[1597,2144,1608],{"class":1607},[1597,2146,1611],{"class":1603},[1597,2148,1608],{"class":1607},[1597,2150,1617],{"class":1616},[1597,2152,1620],{"class":1603},[1597,2154,2155],{"class":1599,"line":1623},[1597,2156,2157],{"class":1607},"    {\n",[1597,2159,2160,2163,2165],{"class":1599,"line":1635},[1597,2161,2162],{"class":1775},"        $group",[1597,2164,1779],{"class":1607},[1597,2166,2167],{"class":1607}," {\n",[1597,2169,2170,2173,2175,2177,2180,2182],{"class":1599,"line":1645},[1597,2171,2172],{"class":1775},"            _id",[1597,2174,1779],{"class":1607},[1597,2176,1782],{"class":1607},[1597,2178,2179],{"class":1673},"$city",[1597,2181,1788],{"class":1607},[1597,2183,2184],{"class":1607},",\n",[1597,2186,2187,2190,2192,2194,2197,2199,2202],{"class":1599,"line":1749},[1597,2188,2189],{"class":1775},"            count",[1597,2191,1779],{"class":1607},[1597,2193,2093],{"class":1607},[1597,2195,2196],{"class":1775}," $sum",[1597,2198,1779],{"class":1607},[1597,2200,2201],{"class":1695}," 1",[1597,2203,1816],{"class":1607},[1597,2205,2206],{"class":1599,"line":1754},[1597,2207,2208],{"class":1607},"        },\n",[1597,2210,2211],{"class":1599,"line":1770},[1597,2212,2213],{"class":1607},"    },\n",[1597,2215,2216,2218],{"class":1599,"line":1819},[1597,2217,1648],{"class":1603},[1597,2219,1651],{"class":1607},[1531,2221,2222],{},"执行结果是：",[1588,2224,2226],{"className":1590,"code":2225,"language":1592,"meta":1593,"style":1593},"[\n    { _id: '北京', count: 3 },\n    { _id: '上海', count: 2 },\n    { _id: '广州', count: 1 },\n]\n",[1535,2227,2228,2233,2260,2285,2309],{"__ignoreMap":1593},[1597,2229,2230],{"class":1599,"line":1600},[1597,2231,2232],{"class":1603},"[\n",[1597,2234,2235,2237,2240,2242,2244,2246,2248,2250,2253,2255,2258],{"class":1599,"line":1623},[1597,2236,1626],{"class":1607},[1597,2238,2239],{"class":1775}," _id",[1597,2241,1779],{"class":1607},[1597,2243,1782],{"class":1607},[1597,2245,1811],{"class":1673},[1597,2247,1788],{"class":1607},[1597,2249,1791],{"class":1607},[1597,2251,2252],{"class":1775}," count",[1597,2254,1779],{"class":1607},[1597,2256,2257],{"class":1695}," 3",[1597,2259,1816],{"class":1607},[1597,2261,2262,2264,2266,2268,2270,2272,2274,2276,2278,2280,2283],{"class":1599,"line":1635},[1597,2263,1626],{"class":1607},[1597,2265,2239],{"class":1775},[1597,2267,1779],{"class":1607},[1597,2269,1782],{"class":1607},[1597,2271,1852],{"class":1673},[1597,2273,1788],{"class":1607},[1597,2275,1791],{"class":1607},[1597,2277,2252],{"class":1775},[1597,2279,1779],{"class":1607},[1597,2281,2282],{"class":1695}," 2",[1597,2284,1816],{"class":1607},[1597,2286,2287,2289,2291,2293,2295,2297,2299,2301,2303,2305,2307],{"class":1599,"line":1645},[1597,2288,1626],{"class":1607},[1597,2290,2239],{"class":1775},[1597,2292,1779],{"class":1607},[1597,2294,1782],{"class":1607},[1597,2296,1892],{"class":1673},[1597,2298,1788],{"class":1607},[1597,2300,1791],{"class":1607},[1597,2302,2252],{"class":1775},[1597,2304,1779],{"class":1607},[1597,2306,2201],{"class":1695},[1597,2308,1816],{"class":1607},[1597,2310,2311],{"class":1599,"line":1749},[1597,2312,2313],{"class":1603},"]\n",[1531,2315,2316],{},"这段配置有三个要点，逐个来看：",[2318,2319,2320,2338,2358],"ul",{},[2321,2322,2323,2326,2327,2330,2331,2333,2334,2337],"li",{},[1535,2324,2325],{},"_id: '$city'","：注意这里的 ",[1535,2328,2329],{},"_id"," 不是文档的 id，在 ",[1535,2332,1556],{}," 里它被重新定义成",[1540,2335,2336],{},"分组依据","，表示「按 city 字段的值分组」。相同城市的文档会被归到同一组。",[2321,2339,2340,2343,2344,2351,2352,2354,2355,2357],{},[1535,2341,2342],{},"'$city'","：在聚合表达式里，",[1540,2345,2346,2347,2350],{},"引用字段的值要在字段名前加 ",[1535,2348,2349],{},"$"," 前缀","，写成 ",[1535,2353,2342],{},"。不加 ",[1535,2356,2349],{}," 的话，MongoDB 会把它当成普通字符串。",[2321,2359,2360,2363,2364,2367,2368,2371,2372,2375,2376,2378,2379,2382],{},[1535,2361,2362],{},"count: { $sum: 1 }","：定义一个名叫 ",[1535,2365,2366],{},"count"," 的新字段，",[1535,2369,2370],{},"$sum: 1"," 表示",[1540,2373,2374],{},"每来一条文档就加一","，数完一组就得到了这组的人数。",[1535,2377,2366],{}," 这个名字是我们自己起的，换成 ",[1535,2380,2381],{},"total"," 也可以。",[1531,2384,2385,2386,2388,2389,2391,2392,2394],{},"可以打个比喻：",[1535,2387,1556],{}," 像把一堆卡片按花色分成几摞，",[1535,2390,2329],{}," 决定按什么分，",[1535,2393,2370],{}," 就是分完后数每一摞有几张。",[1565,2396],{},[1526,2398,2400],{"id":2399},"组合多个阶段","⚡ 组合多个阶段",[1531,2402,2403,2404,2407],{},"单个阶段只能做一件事，聚合管道的威力在于",[1540,2405,2406],{},"把多个阶段组合起来","。来看一个完整需求：统计 24 岁及以上的用户，按城市分组，算出各城市的人数和平均年龄，再按人数从多到少排列。",[1588,2409,2411],{"className":1590,"code":2410,"language":1592,"meta":1593,"style":1593},"db.user.aggregate([\n    // 第一道工序：筛出 age >= 24 的文档\n    { $match: { age: { $gte: 24 } } },\n\n    // 第二道工序：按城市分组，统计人数和平均年龄\n    {\n        $group: {\n            _id: '$city',\n            count: { $sum: 1 },\n            avgAge: { $avg: '$age' },\n        },\n    },\n\n    // 第三道工序：按人数降序排列\n    { $sort: { count: -1 } },\n]);\n",[1535,2412,2413,2427,2432,2461,2465,2470,2474,2482,2496,2512,2535,2539,2543,2547,2553,2579],{"__ignoreMap":1593},[1597,2414,2415,2417,2419,2421,2423,2425],{"class":1599,"line":1600},[1597,2416,1604],{"class":1603},[1597,2418,1608],{"class":1607},[1597,2420,1611],{"class":1603},[1597,2422,1608],{"class":1607},[1597,2424,1617],{"class":1616},[1597,2426,1620],{"class":1603},[1597,2428,2429],{"class":1599,"line":1623},[1597,2430,2431],{"class":1723},"    // 第一道工序：筛出 age >= 24 的文档\n",[1597,2433,2434,2436,2438,2440,2442,2444,2446,2448,2451,2453,2455,2457,2459],{"class":1599,"line":1635},[1597,2435,1626],{"class":1607},[1597,2437,2088],{"class":1775},[1597,2439,1779],{"class":1607},[1597,2441,2093],{"class":1607},[1597,2443,1794],{"class":1775},[1597,2445,1779],{"class":1607},[1597,2447,2093],{"class":1607},[1597,2449,2450],{"class":1775}," $gte",[1597,2452,1779],{"class":1607},[1597,2454,1999],{"class":1695},[1597,2456,2106],{"class":1607},[1597,2458,2106],{"class":1607},[1597,2460,1816],{"class":1607},[1597,2462,2463],{"class":1599,"line":1645},[1597,2464,1718],{"emptyLinePlaceholder":1717},[1597,2466,2467],{"class":1599,"line":1749},[1597,2468,2469],{"class":1723},"    // 第二道工序：按城市分组，统计人数和平均年龄\n",[1597,2471,2472],{"class":1599,"line":1754},[1597,2473,2157],{"class":1607},[1597,2475,2476,2478,2480],{"class":1599,"line":1770},[1597,2477,2162],{"class":1775},[1597,2479,1779],{"class":1607},[1597,2481,2167],{"class":1607},[1597,2483,2484,2486,2488,2490,2492,2494],{"class":1599,"line":1819},[1597,2485,2172],{"class":1775},[1597,2487,1779],{"class":1607},[1597,2489,1782],{"class":1607},[1597,2491,2179],{"class":1673},[1597,2493,1788],{"class":1607},[1597,2495,2184],{"class":1607},[1597,2497,2498,2500,2502,2504,2506,2508,2510],{"class":1599,"line":1859},[1597,2499,2189],{"class":1775},[1597,2501,1779],{"class":1607},[1597,2503,2093],{"class":1607},[1597,2505,2196],{"class":1775},[1597,2507,1779],{"class":1607},[1597,2509,2201],{"class":1695},[1597,2511,1816],{"class":1607},[1597,2513,2514,2517,2519,2521,2524,2526,2528,2531,2533],{"class":1599,"line":1899},[1597,2515,2516],{"class":1775},"            avgAge",[1597,2518,1779],{"class":1607},[1597,2520,2093],{"class":1607},[1597,2522,2523],{"class":1775}," $avg",[1597,2525,1779],{"class":1607},[1597,2527,1782],{"class":1607},[1597,2529,2530],{"class":1673},"$age",[1597,2532,1788],{"class":1607},[1597,2534,1816],{"class":1607},[1597,2536,2537],{"class":1599,"line":1938},[1597,2538,2208],{"class":1607},[1597,2540,2541],{"class":1599,"line":1977},[1597,2542,2213],{"class":1607},[1597,2544,2545],{"class":1599,"line":2016},[1597,2546,1718],{"emptyLinePlaceholder":1717},[1597,2548,2550],{"class":1599,"line":2549},14,[1597,2551,2552],{"class":1723},"    // 第三道工序：按人数降序排列\n",[1597,2554,2556,2558,2561,2563,2565,2567,2569,2572,2575,2577],{"class":1599,"line":2555},15,[1597,2557,1626],{"class":1607},[1597,2559,2560],{"class":1775}," $sort",[1597,2562,1779],{"class":1607},[1597,2564,2093],{"class":1607},[1597,2566,2252],{"class":1775},[1597,2568,1779],{"class":1607},[1597,2570,2571],{"class":1607}," -",[1597,2573,2574],{"class":1695},"1",[1597,2576,2106],{"class":1607},[1597,2578,1816],{"class":1607},[1597,2580,2582,2584],{"class":1599,"line":2581},16,[1597,2583,1648],{"class":1603},[1597,2585,1651],{"class":1607},[1531,2587,2588],{},"逐行走一遍这条流水线：",[2318,2590,2591,2597,2607],{},[2321,2592,2593,2594,2596],{},"数据先经过 ",[1535,2595,1552],{},"：小明 20 岁被筛掉，剩下小红、小刚、小丽、周七、吴八共 5 条进入下一关。",[2321,2598,2599,2600,2602,2603,2606],{},"经过 ",[1535,2601,1556],{},"：按城市分成三摞，北京 2 人（小丽 28、周七 26），上海 2 人（小红 25、吴八 24），广州 1 人（小刚 30）。",[1535,2604,2605],{},"$avg: '$age'"," 会对每组算出平均年龄。",[2321,2608,2599,2609,2611,2612,2615,2616,2619],{},[1535,2610,1559],{},"：",[1535,2613,2614],{},"count: -1"," 表示按人数",[1540,2617,2618],{},"降序","（1 是升序），人数多的城市排在前面。",[1531,2621,2622],{},"结果是：",[1588,2624,2626],{"className":1590,"code":2625,"language":1592,"meta":1593,"style":1593},"[\n    { _id: '北京', count: 2, avgAge: 27 },\n    { _id: '上海', count: 2, avgAge: 24.5 },\n    { _id: '广州', count: 1, avgAge: 30 },\n]\n",[1535,2627,2628,2632,2666,2699,2731],{"__ignoreMap":1593},[1597,2629,2630],{"class":1599,"line":1600},[1597,2631,2232],{"class":1603},[1597,2633,2634,2636,2638,2640,2642,2644,2646,2648,2650,2652,2654,2656,2659,2661,2664],{"class":1599,"line":1623},[1597,2635,1626],{"class":1607},[1597,2637,2239],{"class":1775},[1597,2639,1779],{"class":1607},[1597,2641,1782],{"class":1607},[1597,2643,1811],{"class":1673},[1597,2645,1788],{"class":1607},[1597,2647,1791],{"class":1607},[1597,2649,2252],{"class":1775},[1597,2651,1779],{"class":1607},[1597,2653,2282],{"class":1695},[1597,2655,1791],{"class":1607},[1597,2657,2658],{"class":1775}," avgAge",[1597,2660,1779],{"class":1607},[1597,2662,2663],{"class":1695}," 27",[1597,2665,1816],{"class":1607},[1597,2667,2668,2670,2672,2674,2676,2678,2680,2682,2684,2686,2688,2690,2692,2694,2697],{"class":1599,"line":1635},[1597,2669,1626],{"class":1607},[1597,2671,2239],{"class":1775},[1597,2673,1779],{"class":1607},[1597,2675,1782],{"class":1607},[1597,2677,1852],{"class":1673},[1597,2679,1788],{"class":1607},[1597,2681,1791],{"class":1607},[1597,2683,2252],{"class":1775},[1597,2685,1779],{"class":1607},[1597,2687,2282],{"class":1695},[1597,2689,1791],{"class":1607},[1597,2691,2658],{"class":1775},[1597,2693,1779],{"class":1607},[1597,2695,2696],{"class":1695}," 24.5",[1597,2698,1816],{"class":1607},[1597,2700,2701,2703,2705,2707,2709,2711,2713,2715,2717,2719,2721,2723,2725,2727,2729],{"class":1599,"line":1645},[1597,2702,1626],{"class":1607},[1597,2704,2239],{"class":1775},[1597,2706,1779],{"class":1607},[1597,2708,1782],{"class":1607},[1597,2710,1892],{"class":1673},[1597,2712,1788],{"class":1607},[1597,2714,1791],{"class":1607},[1597,2716,2252],{"class":1775},[1597,2718,1779],{"class":1607},[1597,2720,2201],{"class":1695},[1597,2722,1791],{"class":1607},[1597,2724,2658],{"class":1775},[1597,2726,1779],{"class":1607},[1597,2728,1881],{"class":1695},[1597,2730,1816],{"class":1607},[1597,2732,2733],{"class":1599,"line":1749},[1597,2734,2313],{"class":1603},[2736,2737,2738],"warning",{},[1531,2739,2740,2741,2743,2744,2746,2747,2749],{},"阶段的顺序会影响结果。如果把 ",[1535,2742,1559],{}," 写在 ",[1535,2745,1556],{}," 前面，排序的对象还是原始文档，",[1535,2748,2366],{}," 字段还不存在，排序就没有意义了。写聚合管道时，先在脑子里过一遍「数据流到这一关时长什么样」。",[1565,2751],{},[1526,2753,2755],{"id":2754},"和-find-怎么分工","💡 和 find 怎么分工",[1531,2757,2758,2759,2761],{},"学到这里你可能会问：这些操作为什么不用 ",[1535,2760,1537],{}," 做？两者的分工可以这样把握：",[2318,2763,2764,2773],{},[2321,2765,2766,2769,2770,2772],{},[1540,2767,2768],{},"只是把数据查出来","：用 ",[1535,2771,1537],{},"。条件筛选、排序、分页它都能做，写法简单直观。",[2321,2774,2775,2769,2778,2780,2781,2783],{},[1540,2776,2777],{},"需要分组、统计、多步加工",[1535,2779,1617],{},"。比如按城市统计人数、算平均值、先筛选再统计再排序，这类需求 ",[1535,2782,1537],{}," 做不到或很勉强。",[1531,2785,2786,2787,2789,2790,2792,2793,2795],{},"一句话总结：",[1535,2788,1537],{}," 回答「把数据拿给我」，",[1535,2791,1617],{}," 回答「帮我分析数据」。日常开发中 ",[1535,2794,1537],{}," 用得更多，聚合管道则是处理统计报表类需求的常用工具。",[1565,2797],{},[1526,2799,2801],{"id":2800},"小节总结","🧾 小节总结",[2318,2803,2804,2810,2818,2832,2840,2846],{},[2321,2805,2806,2807,2053],{},"聚合管道把多个阶段串成流水线，数据依次经过每个阶段被逐步加工，语法是 ",[1535,2808,2809],{},"db.集合名.aggregate([阶段数组])",[2321,2811,2812,2814,2815,2817],{},[1535,2813,1552],{}," 负责过滤，条件写法和 ",[1535,2816,1537],{}," 完全一致。",[2321,2819,2820,2822,2823,2825,2826,2828,2829,2831],{},[1535,2821,1556],{}," 负责分组统计，",[1535,2824,2329],{}," 指定分组依据，",[1535,2827,2370],{}," 用来计数，",[1535,2830,2605],{}," 用来算平均值。",[2321,2833,2834,2835,2837,2838,2053],{},"聚合表达式里引用字段的值要加 ",[1535,2836,2349],{}," 前缀，如 ",[1535,2839,2342],{},[2321,2841,2842,2845],{},[1535,2843,2844],{},"$sort: { count: -1 }"," 按字段降序排列，阶段顺序会影响结果。",[2321,2847,2848,2849,2851,2852,2053],{},"简单查询用 ",[1535,2850,1537],{},"，分组统计和多步加工用 ",[1535,2853,1617],{},[1565,2855],{},[1526,2857,2859],{"id":2858},"知识问答","❓ 知识问答",[1531,2861,2862],{},[1540,2863,2864,2865,2867,2868,2870],{},"Q1：",[1535,2866,1556],{}," 里的 ",[1535,2869,2329],{}," 为什么查出来是城市名，而不是文档的 id？",[1531,2872,2873,2874,2876,2877,2879,2880,2882,2883,2885,2886,2888,2889,2891],{},"在 ",[1535,2875,1556],{}," 阶段里，",[1535,2878,2329],{}," 被重新定义为「分组依据」，你写 ",[1535,2881,2325],{},"，输出的 ",[1535,2884,2329],{}," 就是各组的城市值。这是 ",[1535,2887,1556],{}," 的固定语法，和文档自带的 ",[1535,2890,2329],{}," 字段是两回事。",[1531,2893,2894],{},[1540,2895,2896,2897,2899],{},"Q2：什么时候字段名要加 ",[1535,2898,2349],{}," 前缀？",[1531,2901,2902,2903,2906,2907,2909,2910,1553,2912,2915,2916,2918,2919,2921,2922,2924,2925,2053],{},"在聚合管道里，凡是想取",[1540,2904,2905],{},"字段的值","就要加 ",[1535,2908,2349],{},"，比如 ",[1535,2911,2342],{},[1535,2913,2914],{},"'$age'","；不加 ",[1535,2917,2349],{}," 的字符串就是普通文本。而在 ",[1535,2920,1552],{}," 的条件里写法和 ",[1535,2923,1537],{}," 一样，字段名不需要加 ",[1535,2926,2349],{},[1531,2928,2929],{},[1540,2930,2931,2932,2934],{},"Q3：执行 ",[1535,2933,1617],{}," 会修改集合里的数据吗？",[1531,2936,2937],{},"不会。聚合管道只读取数据并返回加工后的结果，原始文档原封不动，可以放心反复执行。",[1531,2939,2940],{},[1540,2941,2942],{},"Q4：$match 写了和 find 一样的条件，为什么还要走聚合管道？",[1531,2944,2945,2946,2948,2949,1553,2951,2953],{},"单看过滤确实没区别。",[1535,2947,1552],{}," 的价值在于它能和 ",[1535,2950,1556],{},[1535,2952,1559],{}," 串起来，先缩小数据范围再做统计，让后面的阶段少处理数据。",[1531,2955,2956],{},[1540,2957,2958],{},"Q5：除了 $sum 和 $avg，还有哪些常用的统计操作？",[1531,2960,2961,2962,2965,2966,2969,2970,2973,2974,2050,2977,2980],{},"常用的还有 ",[1535,2963,2964],{},"$max","（取每组某字段的最大值）、",[1535,2967,2968],{},"$min","（最小值）、",[1535,2971,2972],{},"$first","（每组第一条的某字段值）。掌握 ",[1535,2975,2976],{},"$sum",[1535,2978,2979],{},"$avg"," 的写法后，这几个换上去就能直接用。",[1565,2982],{},[1526,2984,2986],{"id":2985},"小练习","🧪 小练习",[1531,2988,2989,2990,2993,2994,2996],{},"练习一：用聚合管道按城市分组，统计每个城市用户的",[1540,2991,2992],{},"最大年龄","（提示：用 ",[1535,2995,2964],{},"）。",[1588,2998,3000],{"className":1590,"code":2999,"language":1592,"meta":1593,"style":1593},"db.user.aggregate([\n    // 请在这里编写代码\n]);\n",[1535,3001,3002,3016,3021],{"__ignoreMap":1593},[1597,3003,3004,3006,3008,3010,3012,3014],{"class":1599,"line":1600},[1597,3005,1604],{"class":1603},[1597,3007,1608],{"class":1607},[1597,3009,1611],{"class":1603},[1597,3011,1608],{"class":1607},[1597,3013,1617],{"class":1616},[1597,3015,1620],{"class":1603},[1597,3017,3018],{"class":1599,"line":1623},[1597,3019,3020],{"class":1723},"    // 请在这里编写代码\n",[1597,3022,3023,3025],{"class":1599,"line":1635},[1597,3024,1648],{"class":1603},[1597,3026,1651],{"class":1607},[1531,3028,3029],{},"练习二：先筛出 25 岁及以上的用户，再按城市统计人数，并按人数升序排列。",[1588,3031,3032],{"className":1590,"code":2999,"language":1592,"meta":1593,"style":1593},[1535,3033,3034,3048,3052],{"__ignoreMap":1593},[1597,3035,3036,3038,3040,3042,3044,3046],{"class":1599,"line":1600},[1597,3037,1604],{"class":1603},[1597,3039,1608],{"class":1607},[1597,3041,1611],{"class":1603},[1597,3043,1608],{"class":1607},[1597,3045,1617],{"class":1616},[1597,3047,1620],{"class":1603},[1597,3049,3050],{"class":1599,"line":1623},[1597,3051,3020],{"class":1723},[1597,3053,3054,3056],{"class":1599,"line":1635},[1597,3055,1648],{"class":1603},[1597,3057,1651],{"class":1607},[1565,3059],{},[1531,3061,3062],{},"🎉 恭喜你已经掌握聚合管道的入门技能啦，也恭喜你完成了整门 MongoDB 课程！回顾一下这趟旅程：从 Docker 安装与增删改查起步，到条件查询、文档模型的嵌套与数组，再到 Node.js 官方驱动和 Mongoose 操作数据库，最后用索引优化查询、用聚合管道做分组统计。把这套技能和前面的 Express、Node.js 课程结合起来，你已经具备了独立开发全栈项目的数据库功底，挑一个小项目动手练起来吧！",[3064,3065,3066],"style",{},"html pre.shiki code .sndM8, html code.shiki .sndM8{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .s86vT, html code.shiki .s86vT{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .swgpB, html code.shiki .swgpB{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .sYGMc, html code.shiki .sYGMc{--shiki-light:#E2931D;--shiki-default:#FFCB6B;--shiki-dark:#FFCB6B}html pre.shiki code .sIEYB, html code.shiki .sIEYB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .smPcV, html code.shiki .smPcV{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}html pre.shiki code .syuKq, html code.shiki .syuKq{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html pre.shiki code .sd2Uz, html code.shiki .sd2Uz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}",{"title":1593,"searchDepth":1623,"depth":1623,"links":3068},[3069,3070,3071,3072,3073,3074,3075,3076],{"id":1528,"depth":1623,"text":1529},{"id":1569,"depth":1623,"text":1570},{"id":2043,"depth":1623,"text":2044},{"id":2399,"depth":1623,"text":2400},{"id":2754,"depth":1623,"text":2755},{"id":2800,"depth":1623,"text":2801},{"id":2858,"depth":1623,"text":2859},{"id":2985,"depth":1623,"text":2986},"理解聚合管道的工作方式，学会用 $match、$group、$sort 完成分组统计。","md",null,{},{"title":1343},{"title":1521,"description":3077},"fHx2zFtApg",[3085,3087],{"title":1339,"path":1340,"stem":1341,"description":3086,"children":-1},"理解索引的作用，学会创建、查看和删除索引，并用 explain 验证索引是否生效。",{"title":1353,"path":1354,"stem":1355,"description":3088,"children":-1},"了解 GraphQL 是什么、和 REST 有什么区别，用 Apollo Server 搭建第一个 GraphQL 服务并发出第一条查询。",1784715109875]