Let us first create a table wherein we have a Primary Key CustomerId −
mysql> create table DemoTable ( CustomerId int NOT NULL AUTO_INCREMENT, CustomerName varchar(20), CustomerAge int, CustomerCountryName varchar(100), PRIMARY KEY(CustomerId) ); Query OK, 0 rows affected (0.94 sec)
Following is the query to get the primary key “column name” of a specific table in MySQL −
mysql> SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE TABLE_NAME = 'DemoTable' AND CONSTRAINT_NAME = 'PRIMARY';
This will produce the following output −
+-------------+ | COLUMN_NAME | +-------------+ | CustomerId | +-------------+ 1 row in set, 2 warnings (0.12 sec)