深入排查mysql错误DELIMITER $$CREATE TRIGGER CommunityDiscussion_BEFORE_INSERT BEFORE INSERT ON CommunityDiscussion FOR EACH ROWBEGIN DECLARE status BIT1; SELECT status INTO status FROM CommunityTopic WHER

Check the syntax of the trigger creation query. Make sure all the keywords, variables, and identifiers are spelled correctly and in the right order.

Check the table and column names used in the trigger. Make sure they exist in the database and are spelled correctly.

Check the data types of the variables used in the trigger. Make sure they match the data types of the corresponding columns in the database.

Check the SELECT statements used in the trigger. Make sure they return the expected results and handle cases where no rows are returned.

Check the logic of the IF statement. Make sure it evaluates the conditions correctly and triggers the SIGNAL statement when necessary.

Check the SQLSTATE code and MESSAGE_TEXT used in the SIGNAL statement. Make sure they are appropriate for the error being thrown.

Test the trigger with sample data to see if it behaves as expected and catches any errors.