在 SQL Server 中,您可以通过查询系统视图来查找字段的默认值。以下是一些查询字段默认值的常用方法:
- 使用
INFORMATION_SCHEMA.COLUMNS
视图: -
SELECT TABLE_NAME, COLUMN_NAME, COLUMN_DEFAULT FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'YourTableName' AND COLUMN_NAME = 'YourColumnName';
-
将
YourTableName
替换为您要查询的表名,将YourColumnName
替换为您要查询的列名。- 使用
sys.columns
和sys.default_constraints
视图:SELECT c.name AS ColumnName, dc.name AS DefaultConstraintName, dc.definition AS DefaultValue FROM sys.columns c INNER JOIN sys.tables t ON c.object_id = t.object_id INNER JOIN sys.default_constraints dc ON c.default_object_id = dc.object_id WHERE t.name = 'YourTableName' AND c.name = 'YourColumnName';
-
同样,将
YourTableName
和YourColumnName
替换为实际的表名和列名。- 如果您想要查询整个数据库中所有表的所有默认值,可以使用以下查询:
sqlSELECT OBJECT_NAME(cc.object_id) AS TableName, c.name AS ColumnName, dc.name AS DefaultConstraintName, dc.definition AS DefaultValue FROM sys.columns c INNER JOIN sys.objects o ON c.object_id = o.object_id INNER JOIN sys.default_constraints dc ON c.default_object_id = dc.object_id INNER JOIN sys.tables t ON o.object_id = t.object_id WHERE o.type = 'D'; -- 'D' 表示默认约束
这些查询将帮助您找到 SQL Server 数据库中字段的默认值。请根据您的具体需求选择合适的查询语句。
- 使用