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select * into newtable form oldtable;°Ñoldtabel¸´ÖƵ½newtableÇÒnewtable²»´æÔÚ,·ñÔò³ö´í.;
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´ÓTable ±íÖÐÈ¡³öµÚ m Ìõµ½µÚ n ÌõµÄ¼Ç¼£º(Not In °æ±¾)
SELECT TOP n-m+1 *
from Table
WHERE (id NOT IN (SELECT TOP m-1 id from Table ))
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SELECT TOP n-m+1 * from TABLE AS a WHERE Not Exists
(Select * from (Select Top m-1 * from TABLE orde ......
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create table tb(id varchar(3) , pid varchar(3) , name varchar(10))
insert into tb values('001' , null , '¹ã¶«Ê¡')
insert into tb values('002' , '001' , '¹ãÖÝÊÐ')
insert i ......
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"Select * from users where name='"+uName+"' and pwd='"+uPwd+"' " ......
alert index mem_ct monitoring usage;
desc v$object_usage;
set linesize 190
select * from v$object_usage;
SQL>SET AUTOTRACE ON;
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if col_length('±íÃû','×Ö¶Î1') is null ALTER TABLE ±íÃû ADD ×Ö¶Î1 Nvarchar(50) if col_length('±íÃû','×Ö¶Î2') is null ALTER TABLE ±íÃû ADD ×Ö¶Î2 Nvarchar(50) ");
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if col_length('±íÃû','×Ö¶Î1,') is not null ALTER TABLE ±íÃû drop c ......