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SQL code¶¯Ì¬sqlÓï¾ä»ù±¾Óï·¨
1 :ÆÕͨSQLÓï¾ä¿ÉÒÔÓÃExecÖ´ÐÐ
eg: Select * from tableName
Exec('select * from tableName')
Exec sp_executesql N 'select * from tableName'
-- Çë×¢Òâ×Ö·û´®Ç°Ò»¶¨Òª¼ÓN
2:×Ö¶ÎÃû£¬±íÃû£¬Êý¾Ý¿âÃûÖ®Àà×÷Ϊ±äÁ¿Ê±£¬±ØÐëÓö¯Ì¬SQL
eg: declare @fname varchar(20)
set @fname = 'filedName'
Select @fname from tableName
-- ´íÎó,²»»áÌáʾ´íÎ󣬵«½á¹ûΪ¹Ì¶¨ÖµFiledName,²¢·ÇËùÒª¡£
Exec('select ' + @fname + ' from tableName')
-- Çë×¢Òâ ¼ÓºÅÇ°ºóµÄ µ¥ÒýºÅµÄ±ßÉϼӿոñ µ±È»½«×Ö·û´®¸Ä³É±äÁ¿µÄÐÎʽҲ¿É
declare @fname varchar(20) set @fname = 'FiledName'
--ÉèÖÃ×Ö¶ÎÃû
declare @s varchar(1000) set @s = 'select ' + @fname + ' from tableName'
Exec(@s)
-- ³É¹¦
exec sp_executesql @s
-- ´Ë¾ä»á±¨´í
declare @s Nvarchar(1000)
-- ×¢Òâ´Ë´¦¸ÄΪnvarchar(1000)
set @s = 'select ' + @fname + ' from tableName'
Exec(@s)
-- ³É¹¦
exec sp_executesql @s
-- ´Ë¾äÕýÈ·
3. Êä³ö²ÎÊý
declare @num int, @sqls nvarchar(4000)
set @sqls='select count(*) from tableName'
exec(@sqls)
--ÈçºÎ½«execÖ´Ðнá¹û·ÅÈë±äÁ¿ÖУ¿
declare @num int, @sqls nvarchar(4000)
set @sqls='select @a=count(*) from tableName '
exec sp_executesql @sqls,N'@a int output',@num output
select @num
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¡¡¡¡¶ÔÓÚÒ»°ãµÄÓû§¶øÑÔ£¬Í¨¹ýϵͳµÄ× ......
1. ²é¿´Êý¾Ý¿âµÄ°æ±¾
select @@version
2. ²é¿´Êý¾Ý¿âËùÔÚ»úÆ÷²Ù×÷ϵͳ²ÎÊý
exec master..xp_msver
3. ²é¿´Êý¾Ý¿âÆô¶¯µÄ²ÎÊý
sp_configure
4. ²é¿´Êý¾Ý¿âÆô¶¯Ê±¼ä
select convert(varchar(30),login_time,120) from master ......
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ÊÊÓÃÓÚ SQL Server 2000/2005
SELECT TOP Ò³´óС *
from table1
WHERE ......
1.Çå¿ÕÈÕÖ¾
DUMP TRANSACTION ¿âÃû WITH NO_LOG
2.½Ø¶ÏÊÂÎñÈÕÖ¾£º
BACKUP LOG Êý¾Ý¿âÃû WITH NO_LOG
......
±äÁ¿ÉùÃ÷
Syntax:
identifier [CONSTANT] datatype [NOT NULL] [:= | DEFAULT expr];
SQL> declare
2 a date;
3 b number(20) not null :=100;
4 c varchar2(10);
5 d constant number(20) default 1000;
6 begin
7 null;
8 end;
9 /
PL/SQL procedure successful ......