是否有任何查询来获取具有主键外键引用的列列表?如何查询表格的列描述?
SELECT column_name, data_type, CHARacter_maximum_length
FROM DBTIME.information_schema.columns
WHERE table_name = 'Table Name'
从这个查询我得到的数据类型和列的最大长度。除此之外,我需要知道它的外键主键引用。请帮助...
是否有任何查询来获取具有主键外键引用的列列表?如何查询表格的列描述?
SELECT column_name, data_type, CHARacter_maximum_length
FROM DBTIME.information_schema.columns
WHERE table_name = 'Table Name'
从这个查询我得到的数据类型和列的最大长度。除此之外,我需要知道它的外键主键引用。请帮助...
SELECT
K_Table = FK.TABLE_NAME,
FK_Column = CU.COLUMN_NAME,
PK_Table = PK.TABLE_NAME,
PK_Column = PT.COLUMN_NAME,
Constraint_Name = C.CONSTRAINT_NAME
FROM
INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS C
INNER JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS FK
ON C.CONSTRAINT_NAME = FK.CONSTRAINT_NAME
INNER JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS PK
ON C.UNIQUE_CONSTRAINT_NAME = PK.CONSTRAINT_NAME
INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE CU
ON C.CONSTRAINT_NAME = CU.CONSTRAINT_NAME
INNER JOIN (
SELECT
i1.TABLE_NAME,
i2.COLUMN_NAME
FROM
INFORMATION_SCHEMA.TABLE_CONSTRAINTS i1
INNER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE i2
ON i1.CONSTRAINT_NAME = i2.CONSTRAINT_NAME
WHERE i1.CONSTRAINT_TYPE = 'PRIMARY KEY'
) PT
ON PT.TABLE_NAME = PK.TABLE_NAME
SELECT * FROM information_schema.columns WHERE table_name = 'Table Name'
select * from INFORMATION_SCHEMA.TABLE_CONSTRAINTS where TABLE_NAME='Table Name'// It will list all the primary key and foreign key references.
有任何疑问单独获得列的关键字类型。我的意思是,我需要知道列是主键还是外键。如果是外键,那么哪个表的字段就是哪个表。是否有可能从一个查询中找到? – NewBie 2011-03-17 06:20:56
我将最后一部分分割以获得确切结果PT.TABLE_NAME ='Company'和PK.TABLE_NAME ='Company'...谢谢...... :) – NewBie 2011-03-17 10:53:14