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Creating tables by query
We can create new table by using sql. We have seen how to execute a query and get the records or modify the records in MySQL. Same way we can run one sql command to create tables. This can be a part of a script where based on the logic of the script we can design a table and create it.
We will start with simple create query for creating a new table.
$q="CREATE TABLE `sample_tb` (`empno` VARCHAR( 6 ) NOT NULL) ";
The above query will create a table sample_tb and add one column empno to it. But note that we have to execute the above code. After execution we can find out whether the query has successfully executed or not by using one if condition. If the query is not executed successfully then we will print the error message. If table create process is successful then we will display a success message. Here is the code
$q="CREATE TABLE `sample_tb` (`empno` VARCHAR( 6 ) NOT NULL) ";
$q1=mysql_query($q);
if($q1){echo "created table sample_tb....<br>";}
else{echo mysql_error();}
As you can see we have created the table, with one column to store the data. Now what happens if the table sample_tb already exists and we will try to create again? The system will generate an error message. So before trying to create the table we will delete the table and then create again. ( Note: do this if your requirement is there ). We also can't delete the table without checking the table is there or not. So we will use one if exists command like this.
$q="DROP table if exists sample_tb";
$q1=mysql_query($q);
if($q1){echo "deleted the table sample_tb....<br>";}
else{echo mysql_error();}
We can easily execute the create table query to generate the table. Note that this combination is used inside many scripts where temporary tables are create and deleted at the end.
| | mobo | 03-12-2009 |
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can you please tell me how can i copy a table from one user to another in mysqlplus.
Many thanks
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