![]() ![]() This one-page cheat sheet helps us to work with MySQL database more effectively and quickly. NULL: There is no column constraint defined for the third column, thus it is NULL by default and thus Column 3 can contain null values.Įxample 2: Creating a table with a PRIMARY KEY column constraint. MySQL cheat sheet provides a single page that contains all of the most commonly used commands and statements. VARCHAR: It is the datatype of the third column which also specifies a maximum limit of 50 characters in length for the “class”. Column 3: class: It is the name of the third column. In the SQL code editor, add the WHERE condition with the specified value to filter the retrieved data and click Execute. The SQL code editor opens containing the automatically generated SELECT script. NOT NULL: It defines the column constraint of the second column and thus Column 2 cannot contain null values. This article demonstrates how to check the size of MySQL databases and tables by using the phpMyAdmin web interface or the command-line mysql program. To retrieve data from a table use the SELECT command: mysql> SELECT -> FROM student This will return all the data in the table. In Database Explorer, right-click the required table and select Generate Script As > SELECT > To New SQL Window. VARCHAR: It is the datatype of the second column which also specifies a maximum limit of 100 characters in length for the “name”. ![]() Column 2: name: It is the name of the second column. NOT NULL: It defines the column constraint of the first column and thus Column 1 cannot contain null values. INT: It is the datatype of the first column which is Integer. Explanation: Column 1: id: It is the name of the first column.
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