update qry

Le fonction COALESCE de MySQL permet de renvoyer une valeur par défaut si la valeur null est renvoyée initialement.

By using HAVING 'virtual_field' CONDITION we can add conditions to virtual fields that created at SELECT

How to find a given column in a given database in MySQL

Create a new database and its respective user with all privileges

How to remap a value to another inside a mysql query select.

Compare a table against itself to remove records where column value(s) are identical.

Use the same table to query against itself. The greater then sign does the main job of returning only one records of both duplicate records.

You could start a transaction before running your queries and then rollback after running them. Note that to do this you'll require InnoDB or XtraDb tables (won't work on MyISAM).

ensure the url to the csv file is in the root of your file system (eg: C:/mycsvfile.csv)

Given a birthdate in @dob, here are two simple formulae for age in years : (the second formulae is for age in years to two decimal places, ignoring day of month)

You have a schedule table (period, day, subject, room) with a primary key period,day to avoid duplicate bookings. You wish to display the schedule as periods, subjects and rooms in rows, and days of the week in columns.

$connect = mysql_connect("localhost:8889", "root", "root");

This means you need your host, user, pass

$connect = mysql_connect("localhost:8889","root","root");

Means: server, user, pass

Retrieves a relative time in a MySQL Query