sqlserver非空,sql server 非空

如何查询SqlServer中所有表的数据行数,并且显示所有空表非空表

1、以数据库text为例:

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USE text

go

SELECT ?A.NAME,MaxRows = MAX(B.rows)

FROM sys.tables A

INNER JOIN sys.partitions B?ON A.object_id = B.object_id

GROUP BY A.name

ORDER BY MAX(B.rows) DESC?- -按数据行数的降序进行排序显示

2、显示所有空表

USE text

go

SELECT ?A.NAME,MaxRows = MAX(B.rows)

FROM sys.tables A

INNER JOIN sys.partitions B?ON A.object_id = B.object_id

GROUP BY A.name

HAVING MAX(B.rows) = 0

3、显示所有非空表

USE text

go

SELECT ?A.NAME,MaxRows = MAX(B.rows)

FROM sys.tables A

INNER JOIN sys.partitions B?ON A.object_id = B.object_id

GROUP BY A.name

HAVING MAX(B.rows) 0

如何在sqlserver管理平台中为“学生”表的“姓名”字段添加非空值约束。

在现有的学生表对姓名的字段进行非空约束,可以先update学生表的姓名字段为null,再通过alter才触发器设置姓名字段为非空not null。这样操作就可以把现有的学生表中姓名字段设置为非空值约束了。

sql怎么查询出一列中非空的值

空值数据: select count(*) from YourTable where YourColumnName is null

非空值数据: select count(*) from YourTable where YourColumnName is not null

sqlserver Oracle Access 都通用的!

SQLSERVER触发器判断非空值

create trigger DataProarea on testtable

for insert as

if exists(select * from inserted where TestFileds is null)

BEGIN

PRINT 'TestFileds是空值!'

ROLLBACK TRANSACTION

END

ELSE if not exists(select * from inserted join peopletable on inserted.TestFileds=peopletable.Peoplefileds)

begin

PRINT 'TestFileds的值在peopletable表的Peoplefileds中不存在!'

ROLLBACK TRANSACTION

end

GO


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