Error 1242: Subquery returns more than 1 row

Error Code	SQLSTATE	Error	Description
1242	21000	ER_SUBQUERY_NO_1_ROW	Subquery returns more than 1 row

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↑ MariaDB Error Codes 1200 to 1299 ↑
Error 1200: The server is not configured as slave
Error 1201: Could not initialize master info structure
Error 1202: Could not create slave thread; check system resources
Error 1203: User already has more than 'max_user_connections' active connections
Error 1204: You may only use constant expressions with SET
Error 1205: Lock wait timeout exceeded; try restarting transaction
Error 1206: The total number of locks exceeds the lock table size
Error 1207: Update locks cannot be acquired during a READ UNCOMMITTED transaction
Error 1208: DROP DATABASE not allowed while thread is holding global read lock
Error 1209: CREATE DATABASE not allowed while thread is holding global read lock
Error 1210: Incorrect arguments to
Error 1211: is not allowed to create new users
Error 1212: Incorrect table definition; all MERGE tables must be in the same database
Error 1213: Deadlock found when trying to get lock; try restarting transaction
Error 1214: The used table type doesn't support FULLTEXT indexes
Error 1215: Cannot add foreign key constraint
Error 1216: Cannot add or update a child row: a foreign key constraint fails
Error 1217: Cannot delete or update a parent row: a foreign key constraint fails
Error 1218: Error connecting to master
Error 1219: Error running query on master
Error 1220: Error when executing command
Error 1221: Incorrect usage of
Error 1222: The used SELECT statements have a different number of columns
Error 1223: Can't execute the query because you have a conflicting read lock
Error 1224: Mixing of transactional and non-transactional tables is disabled
Error 1225: Option used twice in statement
Error 1226: User has exceeded the resource
Error 1227: Access denied; you need (at least one of) the privilege(s) for this operation
Error 1228: Variable is a SESSION variable and can't be used with SET GLOBAL
Error 1229: Variable is a GLOBAL variable and should be set with SET GLOBAL
Error 1230: Variable doesn't have a default value
Error 1231: Variable can't be set to the value of
Error 1232: Incorrect argument type to variable
Error 1233: Variable can only be set, not read
Error 1234: Incorrect usage/placement
Error 1235: This version of MariaDB doesn't yet support
Error 1236: Got fatal error from master when reading data from binary log
Error 1237: Slave SQL thread ignored the query because of replicate-*-table rules
Error 1238: Variable is a
Error 1239: Incorrect foreign key definition
Error 1240: Key reference and table reference don't match
Error 1241: Operand should contain column(s)
Error 1242: Subquery returns more than 1 row
Error 1243: Unknown prepared statement handler given
Error 1244: Help database is corrupt or does not exist
Error 1245: Cyclic reference on subqueries
Error 1246: Converting column from to
Error 1247: Reference not supported
Error 1248: Every derived table must have its own alias
Error 1249: Select was reduced during optimization
Error 1250: Table from one of the SELECTs cannot be used
Error 1251: Client does not support authentication protocol requested by server
Error 1252: All parts of a SPATIAL index must be NOT NULL
Error 1253: COLLATION is not valid for CHARACTER SET
Error 1254: Slave is already running
Error 1255: Slave already has been stopped
Error 1256: Uncompressed data size too large
Error 1257: ZLIB: Not enough memory
Error 1258: ZLIB: Not enough room in the output buffer
Error 1259: ZLIB: Input data corrupted
Error 1260: Row was cut by GROUP_CONCAT()
Error 1261: Row doesn't contain data for all columns
Error 1262: Row was truncated; it contained more data than there were input columns
Error 1263: Column set to default value; NULL supplied to NOT NULL columnError 1263: Column set to default value; NULL supplied to NOT NULL column
Error 1264: Out of range value for column
Error 1265: Data truncated for column
Error 1266: Using storage engine for table
Error 1267: Illegal mix of collations for operation
Error 1268: Cannot drop one or more of the requested users
Error 1269: Can't revoke all privileges for one or more of the requested users
Error 1270: Illegal mix of collations for operation
Error 1271: Illegal mix of collations for operation
Error 1272: Variable is not a variable component (can't be used as XXXX.variable_name)
Error 1273: Unknown collation
Error 1274: SSL parameters in CHANGE MASTER are ignored because this MariaDB slave was compiled without SSL support
Error 1275: Server is running in --secure-auth mode, but has a password in the old format
Error 1276: Field or reference of SELECT was resolved in SELECT
Error 1277: Incorrect parameter or combination of parameters for START SLAVE UNTIL
Error 1278: It is recommended to use --skip-slave-start when doing step-by-step replication with START SLAVE UNTIL
Error 1279: SQL thread is not to be started so UNTIL options are ignored
Error 1280: Incorrect index name
Error 1281: Incorrect catalog name
Error 1282: Query cache failed to set size; new query cache size is
Error 1283: Column cannot be part of FULLTEXT index
Error 1284: Unknown key cache
Error 1285: MariaDB is started in --skip-name-resolve mode
Error 1286: Unknown storage engine
Error 1287: is deprecated and will be removed in a future release. Please use instead
Error 1288: The target table of the is not updatable
Error 1289: The feature is disabled; you need MariaDB built with to have it working
Error 1290: The MariaDB server is running with the option so it cannot execute this statement
Error 1291: Column has duplicated value
Error 1292: Truncated incorrect value
Error 1293: Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause
Error 1294: Invalid ON UPDATE clause
Error 1295: This command is not supported in the prepared statement protocol yet
Error 1296: Got error from
Error 1297: Got temporary error from
Error 1298: Unknown or incorrect time zone
Error 1299: Invalid TIMESTAMP value in column at row

Error 1242: Subquery returns more than 1 row

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