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MySQL Select displaying Data type in a separate column?
You can use INFORMATION_SCHEMA.COLUMNS for this. Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(20) ); Query OK, 0 rows affected (0.73 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(Name) values('Chris');
Query OK, 1 row affected (0.25 sec)
mysql> insert into DemoTable(Name) values('Robert');
Query OK, 1 row affected (0.26 sec)
mysql> insert into DemoTable(Name) values('Sam');
Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+----+--------+ | Id | Name | +----+--------+ | 1 | Chris | | 2 | Robert | | 3 | Sam | +----+--------+ 3 rows in set (0.00 sec)
Following is the query to display data type and data value −
mysql> SELECT DemoTable.Name, col1.DATA_TYPE FROM DemoTable,INFORMATION_SCHEMA.COLUMNS col1 WHERE col1.TABLE_NAME='DemoTable' AND COLUMN_NAME='Name';
This will produce the following output −
+--------+-----------+ | Name | DATA_TYPE | +--------+-----------+ | Chris | varchar | | Robert | varchar | | Sam | varchar | +--------+-----------+ 3 rows in set (0.04 sec)
Updated on: 30-Jul-2019
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