[SQL Tricks] 一条SQL语句向一张表里插入多条记录 （Multi-table inserts in 9i)

Oracle9i加入了支持一次向多个表同时插入数据的SQL语句---INSERTALL|FIRSTINTO…SELECT…FROM…

INSERTALL|FIRST
[WHENconditionTHEN]INTOtarget[VALUES]
[WHENconditionTHEN]INTOtarget[VALUES]
...
[ELSE]INTOtarget[VALUES]
SELECT...
FROMsource_query;

关于INSERTALL/FIRST,AdrianBillington在他的文章中有详细介绍。

这里主要讲可以用INSERTALL把如下多条SQL语句放到一条SQL语句中来执行，

[code]

SQL>INSERTINTOt(id,val)values(1,'Y');

1rowcreated.

SQL>INSERTINTOt(id,val)values(2,'Y');

1rowcreated.

SQL>INSERTINTOt(id,val)values(3,'Y');

1rowcreated.

SQL>INSERTINTOt(id,val)values(4,'Y');

1rowcreated.

[/code]
用INSERTALL转换===>

[code]

SQL>INSERTALL

2INTOt(id,val)VALUES(1,'Y')

3INTOt(id,val)VALUES(2,'Y')

4INTOt(id,val)VALUES(3,'Y')

5INTOt(id,val)VALUES(4,'Y')

6SELECTNULLFROMdual;

4rowscreated.

SQL>

[/code]