我正在尝试获取给定表的Default Constraints信息。我写了这样的话:
SELECT c.name ,
col.name
FROM Rem.sys.default_constraints c
INNER JOIN Rem.sys.columns col ON col.default_object_id = c.object_id
INNER JOIN Rem.sys.objects o ON o.object_id = c.parent_object_id
INNER JOIN Rem.sys.schemas s ON s.schema_id = o.schema_id
WHERE s.name = 'dbo'
AND o.name = 'Desk_Hist'
但它不会返回默认值。所以我尝试了另一种方式,查询是:
SELECT *
FROM Rem.information_schema.columns columns
WHERE columns.table_catalog = 'Rem'
AND columns.table_schema = 'dbo'
AND columns.table_name = 'Desk_Hist'
AND COLUMN_DEFAULT IS NOT NULL
但它没有给我任何回报。
有人可以帮我吗?
答案 0 :(得分:4)
默认值位于“定义”列中,尝试运行不带位置的查询:
SELECT c.name ,
col.name,
c.definition
FROM Rem.sys.default_constraints c
INNER JOIN Rem.sys.columns col ON col.default_object_id = c.object_id
INNER JOIN Rem.sys.objects o ON o.object_id = c.parent_object_id
INNER JOIN Rem.sys.schemas s ON s.schema_id = o.schema_id
答案 1 :(得分:1)
您的第一个查询应该有效,但您只能在约束表(c.name
)中包含约束名称,而不包含任何其他内容。
尝试在选择列表中加入c.definition