Question

此SQL查询打印表名，列名和列类型（Data，varchar等）。

Table_name Column_name Data_type

SELECT T.TABLE_NAME,C.COLUMN_NAME,C.DATA_TYPE
    FROM INFORMATION_SCHEMA.COLUMNS C
    INNER JOIN INFORMATION_SCHEMA.TABLES T ON C.TABLE_NAME = T.TABLE_NAME
        AND C.TABLE_SCHEMA = T.TABLE_SCHEMA
    WHERE T.TABLE_TYPE = 'BASE TABLE'

如果这个列是复合主键的一部分（见下文），如何更改它以便打印？

Table_name Column_Name Is_Primary（y / n）Data_Type

更新：建议的副本相差甚远，因为它涉及单个表。接受的答案解决了我的问题。

Answer 1

约束名称和类型位于INFORMATION_SCHEMA.TABLE_CONSTRAINTS中，列名称和约束名称位于INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE中。所以，基本上你最终会添加更多JOINS。

SELECT
    T.TABLE_NAME,
    C.COLUMN_NAME,
    C.DATA_TYPE,
    CCU.Constraint_Name,
    CASE TC.Constraint_Type
        WHEN 'PRIMARY KEY' THEN 'Yes'
        ELSE 'No'
    END IsPrimaryKey
FROM INFORMATION_SCHEMA.COLUMNS C
INNER JOIN INFORMATION_SCHEMA.TABLES T
    ON C.TABLE_NAME = T.TABLE_NAME
    AND C.TABLE_SCHEMA = T.TABLE_SCHEMA
LEFT JOIN INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE CCU
    ON CCU.TABLE_SCHEMA = T.TABLE_SCHEMA
    AND CCU.TABLE_NAME = T.TABLE_NAME
    AND CCU.COLUMN_NAME = C.COLUMN_NAME
LEFT JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS TC
    ON CCU.Constraint_Name = TC.Constraint_Name
    AND CCU.Table_Name = TC.Table_Name
    AND CCU.TABLE_SCHEMA = TC.TABLE_SCHEMA
WHERE T.TABLE_TYPE = 'BASE TABLE'
ORDER BY T.TABLE_NAME, C.COLUMN_NAME

如何打印它们的列名和主键？

1 个答案: