How do I check if a record exists on a table?

How do I check if a record exists on a table?

To test whether a row exists in a MySQL table or not, use exists condition. The exists condition can be used with subquery. It returns true when row exists in the table, otherwise false is returned. True is represented in the form of 1 and false is represented as 0.

How is a record deleted from a table?

To remove one or more rows in a table:

1. First, you specify the table name where you want to remove data in the DELETE FROM clause.
2. Second, you put a condition in the WHERE clause to specify which rows to remove. If you omit the WHERE clause, the statement will remove all rows in the table.

What does drop table if exists?

The DROP TABLE statement deletes the specified table, and any data associated with it, from the database. The IF EXISTS clause allows the statement to succeed even if the specified tables does not exist. Attempting to drop the table before dropping the procedure will result in an error.

How to delete table after checking if it exists in MySQL?

One option is to simply try a statement like DELETE, but check for errors. Or catch the exception if you have enabled PDO exceptions. Another strategy would be to query for the table, and do something if it does/doesn’t exist. Thanks for contributing an answer to Stack Overflow!

What does if exists mean in SQL Server?

If one or more such rows exist, IF EXISTS will read enough of the table/index to find the first one, and then UPDATE or DELETE will then re-read that the table to find it again and process it — and it will read “the rest of” the table to see if there are any more to process as well. (Fast enough if properly indexed, but still.)

How to Access VBA code to delete a table if it exists?

First, I must admit, that I am not trained in coding with VBA. I use MS Access macros and queries to build my application. I use some temporary import files, and need to either run a macro, or some VBA, to test if they exist, and then if they do, to delete them.

What happens if SQL Server drop table does not exist?

If you try to do a DROP TABLE first and the table does not exist, it will also fail with the error “Msg 3701 Level 11 State 5, 25 Cannot drop the table because it does not exist or you do not have permission”. How do you solve these problems?