![]() ![]() If you omit the IF NOT EXISTS clause and try to create a table that already exists in the database, then you will get an error message. If the table already exists, then the computer will not create a new table. ![]() ![]() You can place that clause just before the table name. There is an optional clause called IF NOT EXISTS that will check if the table you want to create already exists in the database. )ENGINE=storage_engine What is the IF NOT EXISTS clause? If you omit the ENGINE clause then the default will be InnoDB. In MySQL, you have the option to specify the type of storage engine you want to use for your table. MySQL uses these storage engines to perform CRUD (create, read, update and delete) operations on the database. What are MySQL storage engines?Īccording to the MySQL documentation: Storage engines are MySQL components that handle the SQL operations for different table types. You will sometimes hear this referred to as a statement terminator. The semicolon at the end of the parenthesis tells the computer it is the end of the SQL statement. If you forget the parenthesis, then you will get an error message. ![]() Inside the parenthesis, you will add the information for creating the columns for the table. If I wanted to create a table of teacher information, then I would write something like this: CREATE TABLE teachers() Here is the basic syntax for the CREATE TABLE statement: CREATE TABLE table_name(įor the first part, you need to start with the CREATE TABLE statement followed by the name of the table you want to create. In this tutorial, I will walk you through the SQL syntax for the CREATE TABLE statement using code examples for both PostgreSQL and MySQL. Mysql> CREATE USER IF NOT EXISTS OK, 0 rows affected, 1 warning (4.Knowing how to create tables in SQL is an important and fundamental concept. Mysql> CREATE USER IF NOT EXISTS 4006 (HY000): Operation CREATE USER failed for as it is referenced as a definer account in a view.Īfter grants SET_USER_ID privilege TO show grants | GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, SHUTDOWN, PROCESS, FILE, REFERENCES, INDEX, ALTER, SHOW DATABASES, SUPER, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE, REPLICATION CLIENT, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, CREATE USER, EVENT, TRIGGER, CREATE TABLESPACE, CREATE ROLE, DROP ROLE ON *.* TO | Running the command as root still works correctly, only happens when it is not root running the command. Try running create user as superuser and it will work now fine:ĬREATE USER IF NOT EXISTS OK, 0 rows affected, 1 warning (0.01 sec)Ĭreate trigger with testing user as definer:ĬREATE TABLE account (acct_num INT, amount DECIMAL(10,2)) ĬREATE TRIGGER ins_sum BEFORE INSERT ON account FOR EACH ROW SET = + NEW.amount Īnd now try to create user as superuser and it will end in error:ĬREATE USER IF NOT EXISTS 4006 (HY000): Operation CREATE USER failed for as it is referenced as a definer account in a trigger. Martin Bezdíček I have tested it on version 8.0.29 now and directly MySQL and not using Percona at all.ĬREATE USER ALTER, ALTER ROUTINE, CREATE, CREATE ROLE, CREATE ROUTINE, CREATE TABLESPACE, CREATE TEMPORARY TABLES, CREATE USER, CREATE VIEW, DELETE, DROP, DROP ROLE, EVENT, EXECUTE, FILE, INDEX, INSERT, LOCK TABLES, PROCESS, REFERENCES, RELOAD, REPLICATION CLIENT, REPLICATION SLAVE, SELECT, SHOW DATABASES, SHOW VIEW, SHUTDOWN, SUPER, TRIGGER, UPDATE ON *.* TO testinguser:ĬREATE USER IF NOT EXISTS ALTER, ALTER ROUTINE, CREATE, CREATE ROLE, CREATE ROUTINE, CREATE TABLESPACE, CREATE TEMPORARY TABLES, CREATE USER, CREATE VIEW, DELETE, DROP, DROP ROLE, EVENT, EXECUTE, FILE, INDEX, INSERT, LOCK TABLES, PROCESS, REFERENCES, RELOAD, REPLICATION CLIENT, REPLICATION SLAVE, SELECT, SHOW DATABASES, SHOW VIEW, SHUTDOWN, SUPER, TRIGGER, UPDATE ON *.* TO (Not all the rights are necessary) And I have not found anywhere in documentation that IF NOT EXISTS in CREATE USER should not work if user mentioned is definer.Ĭreate user and make it a definer account in a view or in a trigger and try to create it again with IF NOT EXISTS it will end in ERROR.ĬREATE USER IF NOT EXISTS 4006 (HY000): Operation CREATE USER failed for as it is referenced as a definer account in a view.ĬREATE USER IF NOT EXISTS 4006 (HY000) at line 947: Operation CREATE USER failed for as it is referenced as a definer account in a trigger.įix it in the code CREATE USER procedure. We are running restores for developers and also want to use backup of privileges for the dev environment after restore of data, but if the user is definer of view or trigger it will end in error when running privileges backup created using pt-show-grants and thus having create user if not exists as the part causing issue.Īs long as the users are not definers of view or trigger it works fine. ![]()
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