SQL循环语句 declare @i int set @i=1 while @i<30 begin insert into test (userid) values(@i) set @i=@i+1 end --------------- while 条件 begin 执行操作 set @i=@i+1 end WHILE 设置重复执行 SQL 语句或语句块的条件.只要指定的条件为真,就重复执行语句.可以使用 BREAK 和 CONTINUE 关键字在循环内部控制 WHILE 循环中语句的执行. +…
通过临时表进行sql循环 -----------创建临时表-------------- SELECT * INTO #tempfensitocity FROM( SELECT * FROM dbo.Swb_Jc_FenGongSi fs WHERE NOT EXISTS ( SELECT * FROM dbo.Swb_Jc_FenGongSi AS A INNER JOIN dbo.Swb_Electronic_City AS B ON A.FenGongSiID=B.FengGongSiID…
--循环插入一年的时间 DROP TABLE #temp CREATE TABLE #temp (date DATETIME); DECLARE @year INT ; WITH a1 AS ( SELECT CAST(RTRIM(@year)+'-01-01' AS DATETIME) date UNION ALL ,date) ,date))=@year ) INSERT #temp SELECT date FROM a1 EXCEPT SELECT date FROM #temp ) --…
1.基本 LOOP 循环语句 语法: LOOP 语句序列; END LOOP; 其中,语句序列中需要一个EXIT语句或一个EXIT WHEN语句来中断循环. 实例: DECLARE x ) :; BEGIN LOOP dbms_output.put_line(x); x :; THEN exit; END IF; END LOOP; dbms_output.put_line('LOOP结束: ' || x); END; 或者 使用EXIT WHEN语句来代替EXIT语句: DECLARE x )…
1.if循环做判断 SET SERVEROUTPUT ON accept num prompt 'qinshuu'; DECLARE pnum NUMBER :=& num ; BEGIN THEN SYS.DBMS_OUTPUT.PUT_LINE (') ; ELSIF pnum THEN dbms_output.put_line (') ; ELSE DBMS_OUTPUT.PUT_LINE (') ; END IF ; END ; / 2.引用变量 SET SERVEROUTPUT ON…
declare @i int begin insert into test (userid) values(@i) end --------------- while 条件 begin 执行操作 end --何问起 hovertree.com WHILE设置重复执行 SQL 语句或语句块的条件.只要指定的条件为真,就重复执行语句.可以使用 BREAK 和 CONTINUE 关键字在循环内部控制 WHILE 循环中语句的执行. 语法WHILE Boolean_expression { s…
- --pl/sql Procedural Language /sql --被数据库编译保存,由用户调用 --程序块 /* 语法 Declare – 声明变量 --声明变量 Age int; //没有默认值的变量 Age2 int := 0; begin //写正常的处理语句 dbms_output.put_line('Hello'); end ; / -写一个就是执行 */ --一个hello world 的程序块 declare age INTEGER:=3; begin DBMS_OUTP…
--第一 ) ,),Orders )) declare @n int,@rows int --select @rows=count(1) from pe_Orders select @rows =@@rowcount while @n<=@rows begin select @orderNum=OrderNum from PE_Orders where OrderNum=(select Orders from #ttableName where id=@n) print (@OrderNum…
----PL/SQL基本循环语句 LOOP DECLARE x ; BEGIN LOOP dbms_output.put_line(x); x :; THEN exit; END IF; END LOOP; -- after exit, control resumes here dbms_output.put_line('After Exit x is: ' || x); END; -- 可以用 exit when 代替 exit DECLARE x ; BEGIN LOOP ; dbms_ou…
(1)LOOP...EXIT...END语句示例: control_var:; LOOP then EXIT; END IF; control_var:; END LOOP; 上述,初始化control_var值为0,首先进入循环,若control_var>5就退出LOOP循环,若control_var<=5则将control_var值+1.退出循环时,control_var=5. (2)LOOP...EXIT WHEN ... END语句示例: control_var:; LOOP cont…
),dates datetime) insert @tbl(order_id,dates) select 'A','2014-1-1' union select 'A','2014-2-1' union select 'A','2014-2-2' union select 'B','2014-1-1' union select 'C','2014-1-1' union select 'D','2014-1-1' union select 'D','2014-1-2' union select '…
USE BookDiscuss DECLARE @num INT DECLARE @numdiff INT DECLARE @table VARCHAR(50) DECLARE @sql VARCHAR(8000) SET @numdiff=3 SET @num=0 WHILE @num<@numdiff BEGIN SET @table='DiscussPost_'+CAST(@num AS VARCHAR(10)); SET @sql= '…
<sql id="Example_Where_Clause" > <!-- WARNING - @mbggenerated This element is automatically generated by MyBatis Generator, do not modify. This element was generated :: CST . --> <where > <foreach collection="oredCriter…
declare @itemnumber int --定义需要循环的次数 declare @tagint int --定义标志字段,用于结束循环 select @itemnumber = count(distinct Creater) from Demo_TestTable where isnull(Creater,'')<>'' And ) begin while @tagint<=@itemnumber begin waitfor delay '00:00:01' --每隔一秒再执行…
declare @i intdeclare @qid int set @i=1set @qid=100 while @i<50000begininsert into Order(orderid,ordername) values(@qid,'订单名称')set @i=@i+1set @qid=@qid+1end 海量语句查询代码优化: 具体要注意的:1.应尽量避免在 where 子句中对字段进行 null 值判断,否则将导致引擎放弃使用索引而进行全表扫描,如:select id from t w…
--查询表B,把查询到的数据插入临时表#A中,根据表B 的ID 进行排序:表#A中 的 i 字段 由1开始增加排序: SELECT ROW_NUMBER() OVER ( ORDER BY ID ) i,* INTO #A FROM B DECLARE @count INT; SELECT @count=COUNT(1) FROM #A --获取临时表#A 的总数量,用来循环: DECLARE @i INT=1; …
SQL> create table tt_test ( x int, y char(50) ); Table created. SQL> SQL> begin 2 for i in 1 .. 100000 3 loop 4 insert into t values ( i, 'x' ); 5 end loop; 6 commit; 7 end; 8 / PL/SQL procedure successfully completed. SQL> SQL> select coun…