我需要在SQL server上编写一个查询,以获得特定表中的列列表,其相关数据类型(长度)以及它们是否不为空。我已经做到了这么多。
但现在我还需要得到,在同一个表中,对一个列- TRUE,如果该列是一个主键。
我该怎么做呢?
我的期望输出是:
Column name | Data type | Length | isnull | Pk
我需要在SQL server上编写一个查询,以获得特定表中的列列表,其相关数据类型(长度)以及它们是否不为空。我已经做到了这么多。
但现在我还需要得到,在同一个表中,对一个列- TRUE,如果该列是一个主键。
我该怎么做呢?
我的期望输出是:
Column name | Data type | Length | isnull | Pk
当前回答
查询:执行sp_description _first_result_set并选择年收入 [DB_NAME]。[DBO]。(员工)”
注意:在某些ide中选择n之前是工作的,或者在某些ide中没有选择n是工作的
其他回答
试试这个:
select COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH, IS_NULLABLE
from INFORMATION_SCHEMA.COLUMNS IC
where TABLE_NAME = 'tablename' and COLUMN_NAME = 'columnname'
扩展Alex的答案,您可以这样做以获得PK约束
Select C.COLUMN_NAME, C.DATA_TYPE, C.CHARACTER_MAXIMUM_LENGTH, C.NUMERIC_PRECISION, C.IS_NULLABLE, TC.CONSTRAINT_NAME
From INFORMATION_SCHEMA.COLUMNS As C
Left Join INFORMATION_SCHEMA.TABLE_CONSTRAINTS As TC
On TC.TABLE_SCHEMA = C.TABLE_SCHEMA
And TC.TABLE_NAME = C.TABLE_NAME
And TC.CONSTRAINT_TYPE = 'PRIMARY KEY'
Where C.TABLE_NAME = 'Table'
我一定是错过了您想要一个标记来确定给定的列是否是PK的一部分,而不是PK约束的名称。你可以用:
Select C.COLUMN_NAME, C.DATA_TYPE, C.CHARACTER_MAXIMUM_LENGTH
, C.NUMERIC_PRECISION, C.NUMERIC_SCALE
, C.IS_NULLABLE
, Case When Z.CONSTRAINT_NAME Is Null Then 0 Else 1 End As IsPartOfPrimaryKey
From INFORMATION_SCHEMA.COLUMNS As C
Outer Apply (
Select CCU.CONSTRAINT_NAME
From INFORMATION_SCHEMA.TABLE_CONSTRAINTS As TC
Join INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE As CCU
On CCU.CONSTRAINT_NAME = TC.CONSTRAINT_NAME
Where TC.TABLE_SCHEMA = C.TABLE_SCHEMA
And TC.TABLE_NAME = C.TABLE_NAME
And TC.CONSTRAINT_TYPE = 'PRIMARY KEY'
And CCU.COLUMN_NAME = C.COLUMN_NAME
) As Z
Where C.TABLE_NAME = 'Table'
我有点惊讶居然没人提
sp_help 'mytable'
查询:执行sp_description _first_result_set并选择年收入 [DB_NAME]。[DBO]。(员工)”
注意:在某些ide中选择n之前是工作的,或者在某些ide中没有选择n是工作的
select
c.name as [column name],
t.name as [type name],
tbl.name as [table name]
from sys.columns c
inner join sys.types t
on c.system_type_id = t.system_type_id
inner join sys.tables tbl
on c.object_id = tbl.object_id
where
c.object_id = OBJECT_ID('YourTableName1')
and
t.name like '%YourSearchDataType%'
union
(select
c.name as [column name],
t.name as [type name],
tbl.name as [table name]
from sys.columns c
inner join sys.types t
on c.system_type_id = t.system_type_id
inner join sys.tables tbl
on c.object_id = tbl.object_id
where
c.object_id = OBJECT_ID('YourTableName2')
and
t.name like '%YourSearchDataType%')
union
(select
c.name as [column name],
t.name as [type name],
tbl.name as [table name]
from sys.columns c
inner join sys.types t
on c.system_type_id = t.system_type_id
inner join sys.tables tbl
on c.object_id = tbl.object_id
where
c.object_id = OBJECT_ID('YourTableName3')
and
t.name like '%YourSearchDataType%')
order by tbl.name
根据一个数据库中三个不同表的搜索数据类型,搜索哪个列在哪个表中。这个查询可以扩展到'n'个表。