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MySQL - DROP TABLE Statement
MySQL DROP TABLE Statement
You can drop/delete an existing table using the DROP TABLE Statement. Once you delete a table all records, triggers, constraints and permission of the table are lost.
Syntax
Following is the syntax of the DROP TABLE statement −
DROP TABLE [IF EXISTS] table_name ...
Where, table_name is the name of the table you need to delete.
Example
Suppose we have created tables as shown below −
CREATE TABLE TestTable1(value VARCHAR(10)); CREATE TABLE TestTable2(value VARCHAR(10)); CREATE TABLE TestTable3(value VARCHAR(10)); CREATE TABLE TestTable4(value VARCHAR(10));
If you verify the list of tables you can observe the created ones in the list as follows −
show tables;
Output
Following is the output of the above query −
Tables_in_sample |
---|
employee |
sample |
test |
testtable1 |
testtable2 |
testtable3 |
testtable4 |
You can delete three of the above created tables using the DROP TABLE statement as shown below −
DROP TABLE testtable1; DROP TABLE testtable2; DROP TABLE testtable3;
Once a table is dropped, if you verify the list of the tables as shown below you can see its name is missing −
show tables;
Output
The above mysql query generates the following output −
Tables_in_sample |
---|
employee |
sample |
test |
testtable4 |
The IF EXISTS clause
If you try to drop a table that doesn’t exist error will be generated as shown below −
DROP TABLE demo; ERROR 1051 (42S02): Unknown table 'sample.demo'
If you use the IF EXISTS clause along with the DROP TABLE statement as shown below, the specified table will be dropped and if a table with the given name, doesn’t exist the query will be ignored.
DROP TABLE IF EXISTS demo;
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