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xinmi/migrations/mysql/000215_access_role_permission_version.down.sql
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SET @access_role_permission_version_sql = (
SELECT IF(COUNT(*) > 0,
'ALTER TABLE workbench_access_roles DROP COLUMN permission_version',
'SELECT 1')
FROM information_schema.COLUMNS
WHERE TABLE_SCHEMA = DATABASE()
AND TABLE_NAME = 'workbench_access_roles'
AND COLUMN_NAME = 'permission_version'
);
PREPARE access_role_permission_version_stmt FROM @access_role_permission_version_sql;
EXECUTE access_role_permission_version_stmt;
DEALLOCATE PREPARE access_role_permission_version_stmt;