mysql Archive
22 Feb 2015
Introduction of Web and PHP & Mysql part 1
Introduction of Web and PHP & Mysql In this series of articles we will look into basics of world wide web (commonly know as WWW) and then Php & Mysql. We will work on real world examples and APIs. So let us start. Before diving into world of web development we need to know some
03 Feb 2015
MySQL, add a string in start of all column values
MySQL, add a string in start of all column values Recently I come to know a very cool function in mysql that is CONCAT. There is a table in mysql database known as tbl_clients. Structure of this table is as follows: tbl_clients id int(11) auto_increment, P.K client_name varchar(500) . . . . website varchar(500) there
18 Apr 2014
Mysql – Regex Operator
In Mysql if we want to run a query that has condition like record should start with ‘D’ or ‘E’. Normally we use Like Operator. select * from tablename where name like 'D%' OR name like 'E%' But using REGEX in MySql we can get same result without using OR in query select * from
18 Apr 2014
Mysql – disabling and enabling foreign key checks
Recently I was working on a project in which I have to truncate tables in database. But due to foreign key constraints MySQL was throwing errors. So the solution I found was to disable Foreign Key constraints temporarily delete all data and then again enable the foreign keys. Disable foreign key checks. SET FOREIGN_KEY_CHECKS=0; Enable
06 Jan 2014
MySql – search and replace a string in a column
If we and to search some specific string inside our column data and replace it with other string then we can use replace query of MySql. Suppose table name is ‘users’ and we want to search city column with a value ‘London’ and replace it with ‘New York’ update users set city = replace(city, 'London',