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Here is a workaround for the DROP INDEX IF EXISTS, that is missing in MySQL and MariaDB versions before v10.1.4. You can also use it for every other statement you want, that should be depend on the existence of an INDEX (e.g. for SELECT "info: index exists." like in the example below).
17 Ιαν 2023 · I do not see any straight-forward way to DROP INDEX using IF EXISTS. As a workaround, I wrote the following Procedure, which works for me. IN i_table_name VARCHAR(128), IN i_index_name VARCHAR(128) BEGIN. SET @tableName = i_table_name; SET @indexName = i_index_name; SET @indexExists = 0; SELECT.
DROP {DATABASE | SCHEMA} [IF EXISTS] db_name. DROP DATABASE drops all tables in the database and deletes the database. Be very careful with this statement! To use DROP DATABASE, you need the DROP privilege on the database. DROP SCHEMA is a synonym for DROP DATABASE.
DROP INDEX. The DROP INDEX command is used to delete an index in a table. MS Access: DROP INDEX index_name ON table_name; SQL Server: DROP INDEX table_name.index_name; DB2/Oracle: DROP INDEX index_name; MySQL: ALTER TABLE table_name. DROP INDEX index_name; Previous SQL Keywords Reference Next . Log in Sign Up.
The DROP DATABASE statement drops all tables in the database and deletes the database permanently. Therefore, you need to be very careful when using this statement. The following shows the syntax of the DROP DATABASE statement: DROP DATABASE [IF EXISTS] database_name; Code language: SQL (Structured Query Language) (sql)
To use the IF EXISTS clause, modify the command as follows: DROP INDEX IF EXISTS index_name ON table_name; This modification ensures the command executes without error even if the index does not exist. Examples. Dropping a Basic Index. Here's an example of dropping a simple index: DROP INDEX idx_name ON users;
25 Ιαν 2024 · mysql> DROP DATABASE IF EXISTS databasename; mysql> SHOW DATABASES; Notes: Dropping a database with this command is irreversible and should only be done when you are certain of the decision. Use the IF EXISTS option to prevent errors in case the database does not exist.
