<\/span><\/h2>\n\n\n\nROW_NUMBER( ) OVER([PARTITION BY col_name1,col_name2,\u2026] ORDER BY col_name1 [asc\/desc], col_name2 [asc\/desc],\u2026)<\/code><\/pre>\n\n\n\n<\/span>\u8bf4\u660e<\/span><\/h2>\n\n\n\n\u8fd4\u56de\u6bcf\u4e00\u884c\u5bf9\u5e94\u7684\u3010\u8fde\u7eed\u3011\u987a\u5e8f\u4f4d\u7f6e\u3002\u548cRank \u7684\u533a\u522b\uff0c\u5c31\u662f\u8fde\u7eed\uff0c\u800c\u5728Rank\u91cc\u76f8\u540c\u7684\u503c\u4f4d\u7f6e\u53f7\u4f1a\u76f8\u540c\uff0c\u7c7b\u4f3c\u5e76\u5217\u7b2c\u51e0\u540d\uff0c\u800crow_number\u5219\u4f1a\u987a\u5e8f\u8fde\u7eed\u6392\u4e0b\u53bb\u3002<\/p>\n\n\n\n
- PARTITION BY : \u53ef\u9009\uff0c\u591a\u4e2a\u5b57\u6bb5\u7528\u9017\u53f7\u5206\u5272\u3002\u5982\u679c\u6307\u5b9a\u4e86\uff0c\u5219\u6bcf\u4e2a\u5f00\u7a97\u5206\u533a\u7684\u987a\u5e8f\u53f7\u5404\u81ea\u72ec\u7acb\u3002<\/li>
- ORDER BY \uff1a \u5fc5\u9009\uff0c\u6392\u5e8f\u7684\u5b57\u6bb5\uff0c\u591a\u4e2a\u5b57\u6bb5\u7528\u9017\u53f7\u5206\u5272\u3002<\/li><\/ul>\n\n\n\n
<\/span>\u6837\u4f8b<\/span><\/h2>\n\n\n\n<\/span>\u8868\u6570\u636e<\/span><\/h3>\n\n\n\ngbase> desc t2;\r\n+-------+---------+------+-----+---------+-------+\r\n| Field | Type | Null | Key | Default | Extra |\r\n+-------+---------+------+-----+---------+-------+\r\n| id | int(11) | YES | | NULL | |\r\n| type | int(11) | YES | | NULL | |\r\n| val | int(11) | YES | | NULL | |\r\n+-------+---------+------+-----+---------+-------+\r\n3 rows in set (Elapsed: 00:00:00.00)\r\n\r\ngbase> select * from t2 order by type,val desc;\r\n+------+------+------+\r\n| id | type | val |\r\n+------+------+------+\r\n| 3 | 1 | 133 |\r\n| 2 | 1 | 122 |\r\n| 1 | 1 | 111 |\r\n| 6 | 2 | 244 |\r\n| 5 | 2 | 233 |\r\n| 4 | 2 | 222 |\r\n| 7 | 3 | 333 |\r\n+------+------+------+\r\n7 rows in set (Elapsed: 00:00:00.03)\r\n<\/code><\/pre>\n\n\n\n<\/span>\u65e0PARTITION<\/span><\/h3>\n\n\n\n\u4e0e\u76f4\u63a5order by\u65e0\u5f02\uff0c\u53ea\u662f\u591a\u4e86\u4e00\u4e2a\u3010\u884c\u53f7\u3011\u3002<\/p>\n\n\n\n
gbase> select t2.*,row_number() over(order by val desc) from t2;\r\n+------+------+------+--------------------------------------+\r\n| id | type | val | row_number() over(order by val desc) |\r\n+------+------+------+--------------------------------------+\r\n| 7 | 3 | 333 | 1 |\r\n| 6 | 2 | 244 | 2 |\r\n| 5 | 2 | 233 | 3 |\r\n| 4 | 2 | 222 | 4 |\r\n| 3 | 1 | 133 | 5 |\r\n| 2 | 1 | 122 | 6 |\r\n| 1 | 1 | 111 | 7 |\r\n+------+------+------+--------------------------------------+\r\n7 rows in set (Elapsed: 00:00:00.03)\r\n<\/code><\/pre>\n\n\n\n<\/span>\u5e26Partition<\/span><\/h3>\n\n\n\n\u6309\u7167type\u5f00\u7a97\u5206\u7ec4\uff0c\u6bcf\u4e2a\u5206\u7ec4\u5185\uff0c\u5404\u81ea\u505a\u6392\u5e8f\u540e\u7684\u884c\u53f7\u3002\u53ef\u4ee5\u770b\u5230type=1,2,3\u7684\u505a\u4e86\u4e09\u7ec4\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n
gbase> select t2.*,row_number() over(partition by type order by val desc) row from t2;\r\n+------+------+------+-----+\r\n| id | type | val | row |\r\n+------+------+------+-----+\r\n| 3 | 1 | 133 | 1 |\r\n| 2 | 1 | 122 | 2 |\r\n| 1 | 1 | 111 | 3 |\r\n| 6 | 2 | 244 | 1 |\r\n| 5 | 2 | 233 | 2 |\r\n| 4 | 2 | 222 | 3 |<\/span>\r\n| 7 | 3 | 333 | 1 |\r\n+------+------+------+-----+\r\n7 rows in set (Elapsed: 00:00:00.05)<\/code><\/pre>\n\n\n\n<\/span>\u67e5\u8be2\u6bcf\u4e2aPartition\u7684\u524d2\u540d<\/span><\/h2>\n\n\n\n\u8fd9\u4e2a\u7c7b\u4f3c\u83b7\u53d6\u6bcf\u4e2a\u73ed\u6210\u7ee9\u6700\u597d\u7684\u524d\u51e0\u540d\u7684\u9700\u6c42\u3002\u9700\u8981\u4f7f\u7528\u5d4c\u5957\u67e5\u8be2\uff0c\u5c06row_number\u8fd4\u56de\u7684\u884c\u53f7\uff0c\u4f5c\u4e3a\u4e00\u4e2a\u5217\u505a\u8fc7\u6ee4\u3002<\/p>\n\n\n\n
gbase> select * from (select t2.*,row_number() over(partition by type order by val desc) row from t2) t where row<=2 order by type,row;\r\n+------+------+------+-----+\r\n| id | type | val | row |\r\n+------+------+------+-----+\r\n| 3 | 1 | 133 | 1 |\r\n| 2 | 1 | 122 | 2 |\r\n| 6 | 2 | 244 | 1 |\r\n| 5 | 2 | 233 | 2 |<\/span>\r\n| 7 | 3 | 333 | 1 |\r\n+------+------+------+-----+\r\n5 rows in set (Elapsed: 00:00:00.07)\r\n<\/code><\/pre>\n\n\n\n<\/p>","protected":false},"excerpt":{"rendered":"
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