Category Archives: mysql

MySQL – Having Clause Table of content MySQL Having Clause The MySQL HAVING Clause is used to filter grouped rows in a table based on conditions. This clause is used with the GROUP BY clause to group the rows based on one or more columns and then filter them based on the conditions specified in […]

MySQL – GROUP BY Clause Table of content MySQL GROUP BY Clause The GROUP BY clause in MySQL is used to arrange identical data in a table into groups. For example, let us suppose you have a table of sales data of an organization consisting of date, product, and sales amount. To calculate the total […]

MySQL – Unique Index Table of content MySQL Indexes are used to return the data from the database real quick. The users cannot see the indexes performing, instead they are just used to speed up the queries. However a unique index, in addition to speeding up data retrieval queries, is also used to maintain data […]