qibao16的博客

一、定义变量--简单赋值 declare @a intset @a=5 print @a --使用select语句赋值 declare @user1 nvarchar(50) select @user1='张三'print @user1 declare @user2 nvarchar(50) select @user2 = Name from ST_User where ID=1

语法形式：ROW_NUMBER() OVER(PARTITION BY COL1 ORDER BY COL2) 解释：根据COL1分组，在分组内部根据 COL2排序，而此函数计算的值就表示每组内部排序后的顺序编号（组内连续的唯一的) select * from ( select subject,name,score,ROW_NUMBER() over(PARTITION by subj

SQL SERVER CTE 语法[ WITH common_table_expression> [ ,n ] ] common_table_expression>::= expression_name [ ( column_name [ ,n ] ) ] AS ( CTE_query_definition ) 栗子1：WITH tb_