以下是引用片段: use pangu update employee set e_wage = case when job_level = ’1’ then e_wage*1.08 when job_level = ’2’ then e_wage*1.07 when job_level = ’3’ then e_wage*1.06 else e_wage*1.05 end |
--WHILE CONTINUE BREAK 以下是引用片段: declare @x int @y int @c int select @x = 1 @y=1 while @x < 3 begin print @x --打印变量x 的值 while @y < 3 begin select @c = 100*@x + @y print @c --打印变量c 的值 select @y = @y + 1 end select @x = @x + 1 select @y = 1 end |
--WAITFOR --例 等待1 小时2 分零3 秒后才执行SELECT 语句 以下是引用片段: waitfor delay ’01:02:03’ select * from employee |
--例 等到晚上11 点零8 分后才执行SELECT 语句 以下是引用片段: waitfor time ’23:08:00’ select * from employee |
***SELECT*** 以下是引用片段: select *(列名) from table_name(表名) where column_name operator value ex:(宿主) select * from stock_information where stockid = str(nid) stockname = 'str_name' stockname like '% find this %' stockname like '[a-zA-Z]%' --------- ([]指定值的范围) stockname like '[^F-M]%' --------- (^排除指定范围) --------- 只能在使用like关键字的where子句中使用通配符) or stockpath = 'stock_path' or stocknumber < 1000 and stockindex = 24 not stock*** = 'man' stocknumber between 20 and 100 stocknumber in(10,20,30) order by stockid desc(asc) --------- 排序,desc-降序,asc-升序 order by 1,2 --------- by列号 stockname = (select stockname from stock_information where stockid = 4) |
--------- 子查询 --------- 除非能确保内层select只返回一个行的值, --------- 否则应在外层where子句中用一个in限定符 以下是引用片段: select distinct column_name form table_name --------- distinct指定检索独有的列值,不重复 select stocknumber ,stocknumber + 10 = stocknumber + 10 from table_name select stockname , stocknumber = count(*) from table_name group by stockname |
--------- group by 将表按行分组,指定列中有相同的值 以下是引用片段: having count(*) = 2 --------- having选定指定的组 select * from table1, table2 where table1.id *= table2.id -------- 左外部连接,table1中有的而table2中没有得以null表示 table1.id =* table2.id -------- 右外部连接 select stockname from table1 union [all] ----- union合并查询结果集,all-保留重复行 select stockname from table2 |
***insert*** 以下是引用片段: insert into table_name (Stock_name,Stock_number) value (xxx,xxxx) value (select Stockname , Stocknumber from Stock_table2)---value为select语句 |
***update*** 以下是引用片段: update table_name set Stockname = xxx [where Stockid = 3] Stockname = default Stockname = null Stocknumber = Stockname + 4 |
***delete***
 
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