[关系型数据库][SQL Server]表和字段信息的查询

最后一次更新日期： 2019/3/21

使用到的系统表

--数据库模式
select * from sys.schemas
--数据类型
select * from sys.types
--数据库对象
select * from sys.objects
--表字段
select * from syscolumns
select * from sys.columns
--拓展属性
select * from sys.extended_properties
--索引
select * from sys.indexes
--索引字段
select * from sys.index_columns
--默认约束
select * from sys.default_constraints

查询表信息

--表名，表描述，模式名，记录数
SELECT so.name TableName,sep.value TableDesc,ss.name SchemaName,si2.rows [RowCount]
FROM sys.objects so
JOIN sys.schemas ss ON so.schema_id=ss.schema_id
join sysindexes si2 on so.object_id=si2.id and si2.indid<2
LEFT JOIN sys.extended_properties sep ON so.object_id=sep.major_id AND sep.minor_id=0 AND sep.name='MS_Description' 
WHERE so.type='U' AND so.name<>'dtproperties' --AND so.name='Test'
ORDER BY so.object_id

查询字段信息

--表名，字段名，字段描述，数据类型，长度，精度，小数位数，默认值，是否可空，
--是否自增，是否唯一键，是否主键，索引名，索引类型，索引字段键序数
select so.name TableName,sc.name ColumnName,sep.value ColumnDesc,
    st.name DataType,sc.max_length [DataLength],
    sc2.prec DataPrec,sc2.scale DataScale,sdc.definition DefaultValue,
    sc.is_nullable IsNullable,sc.is_identity IsIdentity,
    ISNULL(si.is_unique_constraint,0) IsUniqueKey,ISNULL(si.is_primary_key,0) IsPrimaryKey,
    si.name IndexName,si.type_desc IndexType,sic.key_ordinal IndexColumnKeyOrdinal
from sys.objects so
join sys.columns sc on so.object_id=sc.object_id
join syscolumns sc2 on sc.object_id=sc2.id and sc.column_id=sc2.colid
join sys.types st on sc.user_type_id=st.user_type_id
left join sys.default_constraints sdc on sc.default_object_id=sdc.object_id
left join sys.extended_properties sep on so.object_id=sep.major_id and sc.column_id=sep.minor_id and sep.name='MS_Description'
left join sys.index_columns sic on sic.object_id=so.object_id and sic.column_id=sc.column_id
left join sys.indexes si on sic.object_id=si.object_id and sic.index_id=si.index_id
where so.type='U' AND so.name<>'dtproperties' --AND so.name='Test'
order by so.object_id,sc.column_id