Create MySQL table based on one or more existing tables. Here we create a new table called TempCustomer for Customers. CREATE TABLE TempCustomer AS SELECT first_name, last_name FROM ExternalCustomer AS c WHERE c.create_date >= ‘8/1/2015’; In the above query, a…
The DROP TABLE statement is used to drop an existing table in a database. It is very easy to drop an existing MySQL table, but you need to be very careful while deleting any existing table because the data lost…
We have seen the SQL SELECT command to fetch data from a MySQL table. We can use a conditional clause called the WHERE Clause to filter out the results. Using this WHERE clause, we can specify selection criteria to select…
A trigger is a special kind of stored procedure that automatically executes when an event occurs in the database server. DML triggers execute when a user tries to modify data through a data manipulation language (DML) event. DML events are INSERT, UPDATE, or DELETE…
A prepared statement (also known as parameterized statement) is simply a SQL query template containing placeholder instead of the actual parameter values. Here is example of PDO statements. <?php $servername = “localhost”; $username = “root”; $password = “”; $dbname = “myDBPDO”; try { $conn…
In MySql Select query make a big role in data manipulation. select is a DML function. The SELECT statement is used to select data from one or more tables. The SQL SELECT command is used to fetch data from the…
The SQL LEFT JOIN returns all records from the left table (jobs), and the matched records from the right table (clients). The result is NULL from the right side, if there is no match. First you can need database connection…
In last tutorial, we have had a glimpse about how to use Group By clause. Rows in a table can be grouped by using one or more columns. For example, rows in products table can be grouped by CategoryID values…