32 строки
856 B
SQL
32 строки
856 B
SQL
SET @preparedStatement = (SELECT IF(
|
|
(
|
|
SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
|
|
WHERE table_name = 'Users'
|
|
AND table_schema = DATABASE()
|
|
AND index_name = 'idx_users_email'
|
|
) > 0,
|
|
'SELECT 1',
|
|
'CREATE INDEX idx_users_email ON Users(Email);'
|
|
));
|
|
|
|
PREPARE createIndexIfNotExists FROM @preparedStatement;
|
|
EXECUTE createIndexIfNotExists;
|
|
DEALLOCATE PREPARE createIndexIfNotExists;
|
|
|
|
SET @preparedStatement = (SELECT IF(
|
|
(
|
|
SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
|
|
WHERE table_name = 'Users'
|
|
AND table_schema = DATABASE()
|
|
AND column_name = 'RemoteId'
|
|
) > 0,
|
|
'ALTER TABLE Users DROP RemoteId;',
|
|
'SELECT 1'
|
|
));
|
|
|
|
PREPARE alterIfNotExists FROM @preparedStatement;
|
|
EXECUTE alterIfNotExists;
|
|
DEALLOCATE PREPARE alterIfNotExists;
|
|
|
|
DROP TABLE IF EXISTS Users;
|