select Expr1 from jiaofei_select where chaoyear='2009' and chaomouth='6月份'
Expr1是userid的别名。
select count(*) from v_userinfo where userid not in (0,528,529,530,531,532,533,534,535,536,537,538,539,540,541,542,543,544,545,546,547,548,549,550,551,552,553,554,555,556,557,558,559,560,561,562,563,564,565,566,567,568,569,570,571,572,573,574,575,576,577,578,579,581,583,584,585,586,587,588,589,590,591,594,595,596,597,598,599,600,601,602,603,604,605,606,607,608,609,610,611,612,613,614,615,616,617,618,619,620,621,622,623,625,626,627,628,629,630,631,632,633,634,635,636,637,638,639,641,642,645,646,647,648,649,650,651,652,653,654,655,656,657,658,659,660,662,663,664,665,666,667,668,669,670,671,673,674,675,676,678,679,680,681,682,683,684,685,686,687,688,689,690,691,692,693,694,695,696,697,698,699,700,701,702,703,704,705,706,708,709,710,711,712,713,714,715,716,717,718,719,720,722,723,724,725,726,727,729,730,731,732,733,734,735,736,737,738,739,740,741,742,743,745,746,747,749,750,751,752,753,754,755,756,757,758,759,760,761,762,763,764,765,766,767,769,770,771,772,773,774,775,776,781,783,784,785,786,787,788,789,790,791,792,793,794,795,796,797,798,799,800,801,802,803,804,805,806,807,808,809,810,811,812,813,815,816,817,818,819,820,821,822,823,824,825,826,827,828,829,830,831,832,834,835,836,838,839,840,841,842,843,844,845,846,847,848,850,851,852,853,854,855,856,857,858,859,860,862,863,864,865,866,867,868,869,870,871,872,873,874,875,876,877,878,879,880,883,884,885,886,887,888,889,890,891,892,893,894,895,896,897,898,899,900,901,902,903,904,906,907,908,909,910,911,912,915,916,917,918,919,920,921,922,923,924,925,926,927,928,929,930,931,932,933,934,936,937,938,939,940,941,942,943,944,945,946,947,948,949,950,951,952,953,954,955,956,957,958,959,960,961,962,963,964,965,966,967,968,969,970,971,972,973,974,975,976,977,978,979,980,981,982,983,984,985,986,987,988,989,990,991,992,993,994,995,996,997,998,999,1000,1001,1002,1003,1004,1005,1006,1007,1008,1009,1010,1011,1012,1013,1014,1015,1016,1017,1018,1019,1020,1021,1022,1023,1024,1025,1026,1028,1029,1030,1031,1032,1033,1034,1035,1036,1037,1038,1039,1040,1041,1042,1043,1044,1045,1046,1047,1048,1049,1050,1051,1052,1053,1054,1055,1056,1057,1058,1059,1060,1061,1062,1063,1064,1065,1066,1067,1068,1069,1070,1071,1072,1073,1074,1075,1076,1077,1078,1079,1080,1081,1082,1083,1084,1085,1086,1087,1088,1089,1090,1091,1092,1093,1094,1095,1096,1097,1098,1099,1100,1101,1102,1103,1104,1105,1106,1107,1108,1109,1110,1111,1112,1113,1114,1115,1116,1117,1118,1119,1120,1121,1122,1123,1124,1125,1126,1127,1128,1129,1130,1131,1132,1133,1134,1135,1136,1137,1138,1139,1140,1141,1142,1143,1144,1145,1146,1147,1148,1149,1150,1151,1152,1153,1154,1155,1156,1157,1158,1159,1160,1161,1162,1163,1164,1165,1166,1167,1168,1169,1170,1171,1172,1173,1174,1175,1176,1177,1178,1179,1180,1181,1182,1183,1184,1185,1186,1187,1188,1189,1190,1191,1192,1193,1194,1195,1196,1197,1198,1199,1200,1201,1202,1203,1204,1205,1206,1207,1208,1210,1211,1212,1213,1214,1215,1216,1217,1218,1219,1220,1221,1222,1223,1224,1225,1226,1227,1228,1229,1230,1232,1233,1234,1235,1236,1237,1238,1239,1240,1241,1242,1243,1244,1245,1246,1247,1248,1249,1250,1251,1252,1253,1254,1255,1256,1257,1258,1259,1260,1261,1262,1263,1264,1265,1266,1267,1268,1269,1270,1271,1272,1273,1274,1275,1276,1277,1278,1279,1280,1281,1282,1284,1285,1287,1288,1289,1290,1292,1293,1294,1295,1296,1297,1298,1299,1300,1301,1302,1303,1304,1305,1306,1307,1308,1309,1310,1311,1312,1314,1315,1316,1317,1318,1319,1320,1321,1322,1323,1324,1325,1326,1327,1328,1329,1330,1331,1332,1333,1334,1335,1336,1337,1338,1340,1341,1342,1343,1344,1345,1346,1347,1348,1349,1350,1351,1353,1354,1355,1356,1357,1358,1359,1360,1361,1362,1363,1364,1365,1366,1367,1368,1369,1370,1371,1372,1373,1374,1375,1376,1377,1378,1379,1380,1381,1382,1383,1384,1385,1387,1388,1389,1390,1391,1392,1393,1394,1395,1396,1397,1398,1399,1401,1402,1403,1404,1405,1406,1407,1408,1409,1410,1411,1412,1413,1414,1415,1416,1417,1418,1419,1420,1421,1422,1423,1424,1425,1426,1427,1429,1430,1431,1432,1433,1434,1435,1436,1437,1438,1439,1440,1441,1442,1443,1444,1445,1446,1447,1448,1449,1450,1451,1452,1453,1454,1455,1456,1457,1458,1459,1460,1461,1462,1463,1464,1465,1466,1467,1468,1469,1470,1471,1472,1473,1474,1475,1476,1477,1478,1479,1480,1481,1482,1483,1484,1485,1486,1487,1488,1489,1490,1491,1492,1493,1494,1495,1496,1497,1498,1499,1500,1501,1502,1503,1504,1505,1506,1507,1508,1509,1510,1511,1512,1513,1514,1515,1516,1517,1518,1519,1520,1521,1522,1523,1524,1525,1526,1527,1528,1529,1530,1531,1532,1533,1534,1535,1536,1537,1538,1539,1540,1541,1542,1543,1544,1545,1546,1547,1548,1549,1550,1551,1552,1553,1554,1555,1556,1557,1558,1559,1560,1561,1562,1563,1564,1565,1566,1567,1568,1569,1570,1571,1572,1573,1574,1575,1576,1577,1578,1579,1580,1581,1582,1583,1584,1585,1586,1587,1588,1589,1590,1591,1592,1593,1594,1595,1596,1597,1598,1599,1600,1601,1602,1603,1604,1605,1606,1607,1607,1608,1609,1610,1611,1612,1613,1614,1615,1616,1617,1619,1620,1621,1623,1624,1625,1626,1627,1628,1630,1631,1632,1633,1634,1635,1636,1637,1638,1639,1640,1641,1642,1643,1644,1645,1646,1647,1648,1649,1650,1651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解决方案 »

  1.   

    用 not exists 替代 not in not in 和not exists如果查询语句使用了not in 那么内外表都进行全表扫描,没有用到索引;而not extsts 的子查询依然能用到表上的索引。所以无论那个表大,用not exists都比not in要快。
    in 与 =的区别
    select name from student where name in ('zhang','wang','li','zhao');

    select name from student where name='zhang' or name='li' or name='wang' or name='zhao'
    的结果是相同的。
      

  2.   

    其实in和exists差不多
    要是数量大的话用索引
      

  3.   

    userid 建个索引
     然后用 not exists 吧
      

  4.   

    代码如下怎么优化sql语句呢?
     Label1.Text = Session["xyear"].ToString() + " " + Session["xmouth"] + "的用户";
            string sql = "";
            PageControl1.PageSize = 15;
             StringBuilder sb = new StringBuilder()
            .Append("0")
            ;
             StringBuilder str = new StringBuilder()
             .Append("select * from jiaofei_select where chaoyear='" + ddyear.SelectedValue + "' and chaomouth='" + ddmouth.SelectedValue + "'");   
     
            DataTable dt = ReturnTable.SelectSql(str.ToString());
            if (dt.Rows.Count > 0)
            {
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    sb.Append("," + dt.Rows[i]["expr1"].ToString());
                }
                if (TextBox1.Text != null && TextBox1.Text != "")
                {
                    sql = "select * from v_userinfo where userid not in (" + sb.ToString() + ") and name like '%" + TextBox1.Text + "%'";
                }
                else
                {
                    if (ddpianqu.Text != null && ddpianqu.Text != "")
                    {
                        sql = "select * from v_userinfo where userid not in (" + sb.ToString() + ") and AddAreaID=" + ddpianqu.SelectedValue + " and AddCommID=" + ddxiaoqu.SelectedValue + "";
                    }
                    else
                    {
                        sql = "select * from v_userinfo where userid not in (" + sb.ToString() + ")";
                    }
                }
      

  5.   

    not in 换成not exists即可
      

  6.   

    6楼正解。
    这个例子中,not exists 和 not in 无区别
    光在userid加索引也不起作用。
    将里边数字做到临时表,一定要建索引。两个表join 起来,例子如下:
    select count(*) from v_userinfo a left join tbl_tmp b on a.userid = b.userid
     where b.userid is null