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Get boolean result whether table exists or not using CASE WHEN in MySQL
For this, you can use INFORMATION_SCHEMA.TABLES and find the table you want to search. Let us first create a table −
mysql> create table DemoTable -> ( -> Id int, -> Name varchar(20) -> ); Query OK, 0 rows affected (1.57 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(101,'Chris'); Query OK, 1 row affected (0.71 sec) mysql> insert into DemoTable values(102,'David'); Query OK, 1 row affected (0.20 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+------+-------+ | Id | Name | +------+-------+ | 101 | Chris | | 102 | David | +------+-------+ 2 rows in set (0.00 sec)
Here is the query to check whether the table exists or not −
mysql> select max(case when table_name = 'DemoTable' then 'Yes the table exist(TRUE)' else 'No(FALSE)' end) AS isTableExists -> from information_schema.tables;
This will produce the following output −
+-------------------------------+ | isTableExists | +-------------------------------+ | Yes the table exist(TRUE) | +-------------------------------+ 1 row in set (0.52 sec)
Updated on: 13-Dec-2019
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