When you work with SQL database you usually need more than 1 table. Some values are in one table and the others are in a different one = division...
When you work with SQL database you usually need more than 1 table. Some values are in one table and the others are in a different one = division...
When you work with SQL database you usually need more than 1 table. Some values are in one table and the others are in a different one = distribution...
When we work with SQL database we usually need to work with more than 1 table. Some values are in one table and the others are in a different...
SELECT clause is used to gain data from a table. This clause is followed by a list of columns, which we need to display. SELECT must always be used...
SELECT DISTINCT is a command used to show unique records in a table. Its use is broad but it is mainly used to remove duplicities in the records when...
Loop is a repeated call of a part of a code with different parameters. Usually the code is bound to certain DML operation such as INSERT or UPDATE. We...
Today, I prepared for you an SQL quiz for experienced beginners and slightly advanced. Successful completion of the quiz should be routine for a person who uses SQL on...
SQL Command INSERT is suitable for situations when we want to insert entries into the table. Insertion of rows can be done in multiple ways (further description below): You...
A trigger is a database object (procedure) that works as a watchdog for certain event. Using database triggers we can catch this event and initiate some additional action –...