SqlSever查询某个表或某个库的列名称、说明、备注、注释,类型等
表或表字段等的注释,是数据库对象的扩展属性同时也支持把一些注释性的内容放到数据库或数据库对象中。
information_schema:系统视图
sys.extended_properties:系统视图
一、sqlserver 查询某个表的列名称、说明、备注、类型等
--sqlserver 查询某个表的列名称、说明、备注、类型等
SELECT
表名 = case when a.colorder = 1 then d.name else '' end,
表说明 = case when a.colorder = 1 then isnull(f.value, '') else '' end,
字段序号 = a.colorder,
字段名 = a.name,
标识 = case when COLUMNPROPERTY(a.id, a.name, 'IsIdentity')= 1 then '√' else '' end,
主键 = case when exists(
SELECT
1
FROM
sysobjects
where
xtype = 'PK'
and parent_obj = a.id
and name in (
SELECT
name
FROM
sysindexes
WHERE
indid in(
SELECT
indid
FROM
sysindexkeys
WHERE
id = a.id
AND colid = a.colid
)
)
) then '√' else '' end,
类型 = b.name,
占用字节数 = a.length,
长度 = COLUMNPROPERTY(a.id, a.name, 'PRECISION'),
小数位数 = isnull(
COLUMNPROPERTY(a.id, a.name, 'Scale'),
0
),
允许空 = case when a.isnullable = 1 then '√' else '' end,
默认值 = isnull(e.text, ''),
字段说明 = isnull(g.[value], '')
FROM
syscolumns a
left join systypes b on a.xusertype = b.xusertype
inner join sysobjects d on a.id = d.id
and d.xtype = 'U'
and d.name<>'dtproperties'
left join syscomments e on a.cdefault = e.id
left join sys.extended_properties g on a.id = G.major_id
and a.colid = g.minor_id
left join sys.extended_properties f on d.id = f.major_id
and f.minor_id = 0
where
d.name = '数据库表名' --如果只查询指定表,加上此where条件,tablename是要查询的表名;去除where条件查询所有的表信息
order by
a.id,
a.colorder
效果如图:
二、查询一个表的所有列名
--查询一个表的所有列名
Select Name FROM SysColumns Where id=Object_Id('查询的数据库表名')
GO
select t.column_name from information_schema.columns t where t.table_name='查询的数据库表名';
第一局执行效果图:
第二句执行效果图:
三、查询一个表的所有列名,字段的注释
------查询一个表的所有列名,字段的注释
SELECT
A.name AS 表名,
B.name AS 字段名,
C.value AS 字段说明
FROM sys.tables A
INNER JOIN sys.columns B ON B.object_id = A.object_id
LEFT JOIN sys.extended_properties C ON C.major_id = B.object_id AND C.minor_id = B.column_id
WHERE A.name = '查询的数据库表名'
效果如图:
四、查询整个数据库语句
/************************************************************
* Code formatted by SoftTree SQL Assistant ?v5.0.97
* Time: 2020/3/24 8:50:02
************************************************************/
-- 名名称和字段名
SELECT
(
CASE WHEN a.colorder = 1 THEN d.name ELSE '' END
) 表名,
a.colorder 字段序号,
a.name 字段名,
(
CASE WHEN COLUMNPROPERTY(a.id, a.name, 'IsIdentity') = 1 THEN '√' ELSE '' END
) 标识,
(
CASE WHEN (
SELECT
COUNT(*)
FROM
sysobjects
WHERE
(
NAME IN (
SELECT
NAME
FROM
sysindexes
WHERE
(id = a.id)
AND (
indid IN (
SELECT
indid
FROM
sysindexkeys
WHERE
(id = a.id)
AND (
colid IN (
SELECT
colid
FROM
syscolumns
WHERE
(id = a.id)
AND (NAME = a.name)
)
)
)
)
)
)
AND (xtype = 'PK')
) > 0 THEN '√' ELSE '' END
) 主键,
b.name 类型,
a.length 占用字节数,
COLUMNPROPERTY(a.id, a.name, 'PRECISION') AS 长度,
ISNULL(
COLUMNPROPERTY(a.id, a.name, 'Scale'),
0
) AS 小数位数,
(
CASE WHEN a.isnullable = 1 THEN '√' ELSE '' END
) 允许空,
ISNULL(e.text, '') 默认值,
ISNULL(g.[value], '') AS 字段说明
FROM
syscolumns a
LEFT JOIN systypes b ON a.xtype = b.xusertype
INNER JOIN sysobjects d ON a.id = d.id
AND d.xtype = 'U'
AND d.name<> 'dtproperties'
LEFT JOIN syscomments e ON a.cdefault = e.id
LEFT JOIN sys.extended_properties g ON a.id = g.major_id
AND a.colid = g.minor_id
ORDER BY
a.id,
a.colorder
本文来自博客园,作者:TomLucas,转载请注明原文链接:https://www.cnblogs.com/lucasDC/p/15023176.html