SQL Server中Table字典数据的查询SQL示例代码

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数据库中的秘密语言:SQL Server中的Table字典数据查询之旅

在数据库的世界里,元数据是其中的核心组成部分,也被称为数据字典。它们定义了数据库的结构和属性。本文将引导您一起在SQL Server中查询Table字典数据的SQL语言魅力。通过下面的示例代码,您将了解到如何查询SQL Server的Table结构信息。让我们跟随狼蚁网站SEO优化的脚步,一起来学习吧!

让我们了解一下数据库中的四类数据:用户数据、元数据、索引和应用元数据。其中,元数据也被称为数据字典,为我们提供了数据库的框架信息。本文将重点关注如何通过SQL查询语句获取Table的字典数据。

以下是查询SQL Server Table结构的T-SQL代码示例:

```sql

SELECT

CASE WHEN a.colorder=1 THEN d.name ELSE '' END AS 表名,

a.colorder AS 字段序号,

a.name AS 字段名,

CASE WHEN a.colorder=1 THEN ISNULL(f.value,'') ELSE '' END AS 表说明,

CASE WHEN COLUMNPROPERTY(a.id,a.name,'IsIdentity')=1 THEN '是' ELSE '否' END AS 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 '是主键' ELSE '非主键' END AS 主键,

b.name AS 类型,

a.length AS 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 '允许为空' ELSE '不允许为空' END AS 是否允许为空值,

ISNULL(e.text,'') AS 默认值,

ISNULL(g.[value], ' ') AS [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

sysments e ON a.cdefault=e.id

LEFT JOIN

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