Deleting a data table in a command prompt window

MySQL It's very easy to delete a data table in , But you should be very careful when deleting tables , Because after executing the delete command, all data will disappear .

grammar

Here is the deletion MySQL General syntax for data tables ：

DROP TABLE table_name ;

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Delete the data table in the command prompt window

stay mysql> Delete the data table in the command prompt window SQL Statement for DROP TABLE ：

example

The following example deletes the data table runoob_tbl:

[email protected]# mysql -u root -p
Enter password:*******
mysql> use RUNOOB;
Database changed
mysql> DROP TABLE runoob_tbl
Query OK, 0 rows affected (0.8 sec)
mysql>

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Use PHP Script delete data table

PHP Use mysqli_query Function to delete MySQL Data sheet .

This function takes two arguments , Returns... On successful execution TRUE, Otherwise return to FALSE.

grammar

mysqli_query(connection,query,resultmode);

Parameters	describe
connection	It's necessary . Stipulate what to use MySQL Connect .
query	It's necessary , Specify the query string .
resultmode	Optional . A constant . It can be any of the following values ：MYSQLI_USE_RESULT（ If you need to retrieve a lot of data , Please use this ）MYSQLI_STORE_RESULT（ Default ）

• MYSQLI_USE_RESULT（ If you need to retrieve a lot of data , Please use this ）
• MYSQLI_STORE_RESULT（ Default ）

example

The following example uses PHP Script delete data table runoob_tbl:

Delete database

<?php
$dbhost = 'localhost';  // mysql Server host address 
$dbuser = 'root';            // mysql user name 
$dbpass = '123456';          // mysql User name, password 
$conn = mysqli_connect($dbhost, $dbuser, $dbpass);
if(! $conn )
{
  die(' The connection fails : ' . mysqli_error($conn));
}
echo ' Successful connection <br />';
$sql = "DROP TABLE runoob_tbl";
mysqli_select_db( $conn, 'RUNOOB' );
$retval = mysqli_query( $conn, $sql );
if(! $retval )
{
  die(' Data table deletion failed : ' . mysqli_error($conn));
}
echo " Data table deleted successfully \n";
mysqli_close($conn);
?>

mysql> show tables;
Empty set (0.01 sec)