語(yǔ)法：row_number() over(partition by column order by column)
簡(jiǎn)單的說(shuō)row_number()從1開(kāi)始，為每一條分組記錄返回一個(gè)數(shù)字，這里的row_number() over (order by cylh desc) 是先把xlh列降序，再為降序以后的每條cylh記錄返回一個(gè)序號(hào)。
示例：
分析：row_number() over (partition by col1 order by col2) 表示根據(jù)col1分組，在分組內(nèi)部根據(jù) col2排序，而此函數(shù)計(jì)算的值就表示每組內(nèi)部排序后的順序編號(hào)（組內(nèi)連續(xù)的唯一的)
也可這樣使用：row_number() over (order by col2)
例子：
建立測(cè)試表，并插入測(cè)試數(shù)據(jù)
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create table test_row_number_01( cmzh varchar(10) not null, cylh varchar(10) null, mje money null,); |
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insert into test_row_number_01(cmzh,cylh,mje) values (2106000011,20281997,10.50)insert into test_row_number_01(cmzh,cylh,mje) values(2106000010,20281996,10.50)insert into test_row_number_01(cmzh,cylh,mje) values(2106000008,20281995,0.00)insert into test_row_number_01(cmzh,cylh,mje) values(2106000006,20281994,9.50)insert into test_row_number_01(cmzh,cylh,mje) values(2106000004,20281993,5.50)insert into test_row_number_01(cmzh,cylh,mje) values(2106000001,20281992,10.50)insert into test_row_number_01(cmzh,cylh,mje) values(2106000002,20281992,10.50)insert into test_row_number_01(cmzh,cylh,mje) values(2106000007,20217280,0.00)insert into test_row_number_01(cmzh,cylh,mje) values(2106000009,20172458,5.50)insert into test_row_number_01(cmzh,cylh,mje) values(2106000005,20121813,0.00) |
執(zhí)行腳本自動(dòng)生成行號(hào)并按cylh進(jìn)行排序（滑動(dòng)查看代碼）
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select row_number()over(order by cylh desc) as rownum,* from test_row_number_01 |
結(jié)果如下：
注意：在使用over等開(kāi)窗函數(shù)時(shí)，over里頭的分組及排序的執(zhí)行晚于“where，group by，order by”的執(zhí)行。
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原文鏈接：https://www.cnblogs.com/since-1995/p/15629029.html
