sqlserver判断字段类型

要判断SQL Server中的字段类型，有几种方法可以使用。其中一种方法是使用以下代码查询整个数据库的表及其数据类型和说明：

SELECT object_name(ID) AS 表名, c.name AS 字段名, t.name AS 数据类型, c.length AS 长度, c.isnullable AS 是否可空, c.collation AS 字符排序规则, p.value AS 说明
FROM syscolumns c
JOIN systypes t ON c.xtype = t.xtype
LEFT JOIN sys.extended_properties p ON c.id = p.major_id AND c.colid = p.minor_id
WHERE objectproperty(c.id, 'IsUserTable') = 1
ORDER BY object_name(ID), c.colorder

这段代码将返回每个字段的表名、字段名、数据类型、长度、是否可空、字符排序规则和说明。注意，在查询之前，你需要将`<em>sql</em>`替换为实际的数据库名称。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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