SQL语句 返回一个数据表的字段,类型和大小及数据库中的表名和详细信息等
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一、在数据库里,我有一个表tb1的结构如下:
用一条SQL语句返回这个表的列名、类型及大小,如下:
实现的SQL语句为:
SELECT c.name As 'colName', t.name 'colType', c.prec 'colSize'
FROM systypes t,syscolumns c
WHERE t.xtype=c.xtype
AND c.id = (SELECT id FROM sysobjects WHERE name='表名')
ORDER BY c.colid
二、[转]sql 列出数据库中所有表及字段详细信息
--select name from sysobjects where type='U' order by name
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 sysproperties g on a.id=g.id AND a.colid = g.smallid
order by a.id,a.colorder
三、返回数据库中所有的表名
select name from sysobjects where type='U' order by name