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Tunde Adegoroye
20,597 PointsDatabases the purpose of IF EXISTS
I've been going through the databases library can someone help explain the purpose of IF EXIST i can't seem to grasp why it's important to use i've tried doing research on the net too see examples but none of them are really clear to me would be helpful for just a basic explanation
Thanks
2 Answers
Rajanand Ilangovan
3,226 PointsFor example, you want to create a table in a database.
- You write a sql code to create a table.
- Execute it and table is created if not exist else it returns an error message "There is already an object named 'table_name_here' in the database.
So, what will we do? Drop the existing table and re-execute our sql code to create the table. To do this, we can use IF EXISTS. If the object exist, drop the object first. and then create table sql code will get execute successfully without any error.
Tunde Adegoroye
20,597 PointsOhhhh alright i get it now sort of like replacing something that's already there and avoiding errors thanks for that
Rajanand Ilangovan
3,226 Pointsyes, that's right Tunde. if it answers your question, mark it as answer. :)
Tunde Adegoroye
20,597 PointsThanks for that mate how do i mark your answer haha still a bit of a noob