MySQL SQL查询以查找表的主键？
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SQL query to find Primary Key of a table?
提问by sky scraper
How can I find which column is the primary keyof a table by using a query?
如何使用查询查找表的主键是哪一列？
采纳答案by Jo?o Silva
For Oracle, you can look it up in the ALL_CONSTRAINTStable:
对于 Oracle，您可以在ALL_CONSTRAINTS表中查找：
SELECT a.COLUMN_NAME
FROM all_cons_columns a INNER JOIN all_constraints c
ON a.constraint_name = c.constraint_name
WHERE c.table_name = 'TBL'
AND c.constraint_type = 'P';
DEMO.
演示。
For SQL Server, it was already answered here, and for MySQL check @ajon's answer.
回答by ajon
This is a duplicate question:
这是一个重复的问题：
credit to Lukmdo for this answer:
这个答案归功于 Lukmdo：
It might be not advised but works just fine:
可能不建议这样做，但效果很好：
show index from TABLE where Key_name = 'PRIMARY' ;
The solid way is to use information_schema:
可靠的方法是使用information_schema：
SELECT k.COLUMN_NAME
FROM information_schema.table_constraints t
LEFT JOIN information_schema.key_column_usage k
USING(constraint_name,table_schema,table_name)
WHERE t.constraint_type='PRIMARY KEY'
AND t.table_schema=DATABASE()
AND t.table_name='owalog';
回答by Romuald Brunet
For MySQL:
对于 MySQL：
SELECT GROUP_CONCAT(COLUMN_NAME), TABLE_NAME
FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
WHERE
TABLE_SCHEMA = '**database name**'
AND CONSTRAINT_NAME='PRIMARY'
GROUP BY TABLE_NAME;
Warninga primary key with two columns will have them separated by a coma (,)
警告具有两列的主键将用逗号 ( ,)分隔它们
回答by user1577417
Try this query in SQL server:
在 SQL 服务器中试试这个查询：
SELECT X.NAME AS INDEXNAME,
COL_NAME(IC.OBJECT_ID,IC.COLUMN_ID) AS COLUMNNAME
FROM SYS.INDEXES X
INNER JOIN SYS.INDEX_COLUMNS IC
ON X.OBJECT_ID = IC.OBJECT_ID
AND X.INDEX_ID = IC.INDEX_ID
WHERE X.IS_PRIMARY_KEY = 1
AND OBJECT_NAME(IC.OBJECT_ID)='YOUR_TABLE'
回答by BhandariS
The following query gives the list of all the primary keys in the given database.
以下查询提供给定数据库中所有主键的列表。
SELECT DISTINCT TABLE_NAME ,column_name
FROM INFORMATION_SCHEMA.key_column_usage
WHERE TABLE_SCHEMA IN ('*your_db_name*');
回答by Brian Wangombe
In mySQL
在我的SQL
SHOW COLUMNS FROM `table_name`;
This show the details of the columns ie field, data-type, key etc.
这显示了列的详细信息，即字段、数据类型、键等。
回答by Peter Lionhart
LEFT joining table_constraints seems to take more time on mine. i use Information_schema.COLUMNS
LEFT 加入 table_constraints 似乎需要更多时间在我身上。我使用 Information_schema.COLUMNS
SELECT TABLE_SCHEMA , TABLE_NAME , COLUMN_NAME FROM Information_schema.Columns WHERE COLUMN_KEY = "PRI" AND TABLE_SCHEMA = DATABASE()
SELECT TABLE_SCHEMA , TABLE_NAME , COLUMN_NAME FROM Information_schema.Columns WHERE COLUMN_KEY = "PRI" AND TABLE_SCHEMA = DATABASE()
