IF OBJECT_ID(N'STUDENT') IS NOT NULL DROP TABLE STUDENT GO 这是T-SQL语句,IF OBJECT_ID(N'STUDENT') IS NOT NULLDROP TABLE STUDENTGO这是T-SQL语句,

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IF OBJECT_ID(N'STUDENT') IS NOT NULL DROP TABLE STUDENT GO 这是T-SQL语句,IF OBJECT_ID(N'STUDENT') IS NOT NULLDROP TABLE STUDENTGO这是T-SQL语句,
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IF OBJECT_ID(N'STUDENT') IS NOT NULL DROP TABLE STUDENT GO 这是T-SQL语句,IF OBJECT_ID(N'STUDENT') IS NOT NULLDROP TABLE STUDENTGO这是T-SQL语句,
IF OBJECT_ID(N'STUDENT') IS NOT NULL DROP TABLE STUDENT GO 这是T-SQL语句,
IF OBJECT_ID(N'STUDENT') IS NOT NULL
DROP TABLE STUDENT
GO
这是T-SQL语句,

IF OBJECT_ID(N'STUDENT') IS NOT NULL DROP TABLE STUDENT GO 这是T-SQL语句,IF OBJECT_ID(N'STUDENT') IS NOT NULLDROP TABLE STUDENTGO这是T-SQL语句,
这条语句是在判断是否有 STUDENT 这张表,如果有的话就删除!OBJECT_ID() 其实是一个系统函数用于返回对象标识号,因为在SQL-Server 中 在一个数据库中不存在相同的表名,而且每个表名都进行了ID标识 ,所以可以用这个函数来判断是否有某个对象的存在.

IF OBJECT_ID(N'STUDENT') IS NOT NULL DROP TABLE STUDENT GO 这是T-SQL语句,IF OBJECT_ID(N'STUDENT') IS NOT NULLDROP TABLE STUDENTGO这是T-SQL语句, OBJECT_ID ('student',在SQL里IF OBJECT_ID ('student','U') IS NOT NULL U SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[#TEMPID1]') AND type in (N'U')sys.objects ,OBJECT_ID(N'[dbo].[#TEMPID1]'); type in (N'U');各部分什么意思? 数据库中if OBJECT_ID ('dbo.table_test_6_1','u') is not null drop table table_test_6_1判断是否存在该 if ((n!=0)&&(n select * from v$locked_object a,user_objects b where a.OBJECT_ID = b.object_id(+) 后面的（+）啥意思 C语言 if(n if(n&(1 SQL 请高手帮忙看一下以下语法哪里有错误.USE tempdb;IF OBJECT_ID('dbo.Arrays') IS NOT NULL DROP TABLE dbo.Arrays;CREATE TABLE dbo.Arrays(arrid VARCHAR(10) NOT NULL PRIMARY KEY,array VARCHAR(8000) NOT NULL)GOINSERT INTO Arrays(arrid,arr if ((n & -n) == n) if m || n) exit(0) 急,the demo class is the only factor to ---if we will get the stude急,the demo class is the only factor to ---if we will get the student.横线处填什么?我想说决定,但是 deceide听着好像不大对劲啊.这个“决定”该用哪个词 急求3道英文数学题,急急急!谢谢达人QUESTION 1 IF A PROBABILITY DISTRIBUTION HAS A MEAN OF 7.4 AND A STANDARD DEVIATION OF 1.5, WHAT IS THE PROBABILITY THAT A RANDOM VARIABLE WILL HAVE A VALUE GREATER THAN 8 QUESTION 2 A TOTAL OF 36 STUDE c语言：main()?{int n;?scanf(%d,&n);?if(n++ ;while(1){b[l++]=n;if(n&1)n=1+n+(n >=1 ;if(n=1 ;if(n C语言中if(n%2)是什么意思 do{if(i%3)continue;n++;}while(! Q6:Ifσ is unknown,and n