return`SELECT SCHEMA_NAME as schema_name FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME NOT IN ('MYSQL', 'INFORMATION_SCHEMA', 'PERFORMANCE_SCHEMA'${skip?skip.reduce((sql,schemaName)=>sql+=`,${this.escape(schemaName)}`,''):''});`;
return`SELECT SCHEMA_NAME as schema_name FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME NOT IN ('MYSQL', 'INFORMATION_SCHEMA', 'PERFORMANCE_SCHEMA'${skip?skip.reduce((sql,schemaName)=>sql+=`,${this.escape(schemaName)}`,''):''});`;