Delete row if table exists SQL

For SQL Server: You could use:

IF OBJECT_ID('tablename','U') IS NOT NULL

This one deletes the row and does not complain if it can't.

DELETE IGNORE FROM table WHERE id=1

source here.

To check in SQL SERVER,

IF (EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'TheSchema' AND  TABLE_NAME = 'TheTable'))
BEGIN
    --Do Stuff
END

To check in mysql:

You simply count:

SELECT COUNT(*)
FROM information_schema.tables 
WHERE table_schema = '[database name]' 
AND table_name = '[table name]';

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