Inner query Demo : Correlated Subquery « Subquery « Oracle PL / SQL

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Oracle PL / SQL » Subquery » Correlated Subquery 
Inner query Demo
   
SQL>
SQL> create table t
  2  as
  3  select object_name ename,
  4         mod(object_id,50deptno,
  5         object_id sal
  6    from all_objects
  7   where rownum <= 1000
  8  /

Table created.

SQL>
SQL>
SQL>
SQL> select deptno, ename, sal
  2  from t e1
  3  where (select count(*)
  4         from t e2
  5         where e2.deptno = e1.deptno
  6         and e2.sal >= e1.sal<= 3
  7  order by deptno, sal desc
  8  /

DEPTNO ENAME                               SAL
------ ------------------------------ --------
     V_$LOCK                         1050.00
       V_$BUFFER_POOL_STATISTICS       1000.00
       V_$DLM_ALL_LOCKS                 950.00

     V$LOCK                          1051.00
       V$BUFFER_POOL_STATISTICS        1001.00
       V$DLM_ALL_LOCKS                  951.00

     V_$SESSTAT                      1052.00
       V_$INSTANCE_RECOVERY            1002.00
       V_$DLM_LOCKS                     952.00

DEPTNO ENAME                               SAL
------ ------------------------------ --------

     V$SESSTAT                       1053.00
       V$INSTANCE_RECOVERY             1003.00
       V$DLM_LOCKS                      953.00

     V_$MYSTAT                       1054.00
       V_$CONTROLFILE                  1004.00
       V_$DLM_RESS                      954.00

     V$MYSTAT                        1055.00
       V$CONTROLFILE                   1005.00

DEPTNO ENAME                               SAL
------ ------------------------------ --------
     V$DLM_RESS                       955.00

     V_$SUBCACHE                     1056.00
       V_$LOG                          1006.00
       V_$HVMASTER_INFO                 956.00

     V$SUBCACHE                      1057.00
       V$LOG                           1007.00
       V$HVMASTER_INFO                  957.00

     V_$SYSSTAT                      1058.00

DEPTNO ENAME                               SAL
------ ------------------------------ --------
     V_$STANDBY_LOG                  1008.00
       V_$GCSHVMASTER_INFO              958.00

     V$SYSSTAT                       1059.00
       V$STANDBY_LOG                   1009.00
       V$GCSHVMASTER_INFO               959.00

    10 V_$STATNAME                     1060.00
       V_$DATAGUARD_STATUS             1010.00
       V_$GCSPFMASTER_INFO              960.00


DEPTNO ENAME                               SAL
------ ------------------------------ --------
    11 V$STATNAME                      1061.00
       V$DATAGUARD_STATUS              1011.00
       V$GCSPFMASTER_INFO               961.00

    12 V_$OSSTAT                       1062.00
       V_$THREAD                       1012.00
       GV_$DLM_TRAFFIC_CONTROLLER       962.00

    13 V$OSSTAT                        1063.00
       V$THREAD                        1013.00
       GV$DLM_TRAFFIC_CONTROLLER        963.00

DEPTNO ENAME                               SAL
------ ------------------------------ --------

    14 V_$ACCESS                       1064.00
       V_$PROCESS                      1014.00
       V_$DLM_TRAFFIC_CONTROLLER        964.00

    15 V$ACCESS                        1065.00
       V$PROCESS                       1015.00
       V$DLM_TRAFFIC_CONTROLLER         965.00

    16 V_$OBJECT_DEPENDENCY            1066.00
       V_$BGPROCESS                    1016.00

DEPTNO ENAME                               SAL
------ ------------------------------ --------
    16 V_$GES_ENQUEUE                   966.00

    17 V$OBJECT_DEPENDENCY             1067.00
       V$BGPROCESS                     1017.00
       V$GES_ENQUEUE                    967.00

    18 V_$DBFILE                       1068.00
       V_$SESSION                      1018.00
       V_$GES_BLOCKING_ENQUEUE          968.00

    19 V$DBFILE                        1069.00

DEPTNO ENAME                               SAL
------ ------------------------------ --------
    19 V$SESSION                       1019.00
       V$GES_BLOCKING_ENQUEUE           969.00

    20 V_$FILESTAT                     1070.00
       V_$LICENSE                      1020.00
       V_$GC_ELEMENT                    970.00

    21 V$FILESTAT                      1071.00
       V$LICENSE                       1021.00
       V$GC_ELEMENT                     971.00


DEPTNO ENAME                               SAL
------ ------------------------------ --------
    22 V_$TEMPSTAT                     1072.00
       V_$TRANSACTION                  1022.00
       V_$CR_BLOCK_SERVER               972.00

    23 V$TEMPSTAT                      1073.00
       V$TRANSACTION                   1023.00
       V$CR_BLOCK_SERVER                973.00

    24 V_$LOGFILE                      1074.00
       V_$BSP                          1024.00
       V_$CURRENT_BLOCK_SERVER          974.00

DEPTNO ENAME                               SAL
------ ------------------------------ --------

    25 V$LOGFILE                       1075.00
       V$BSP                           1025.00
       V$CURRENT_BLOCK_SERVER           975.00

    26 V_$FLASHBACK_DATABASE_LOGFILE   1076.00
       V_$FAST_START_SERVERS           1026.00
       V_$GC_ELEMENTS_W_COLLISIONS      976.00

    27 V$FLASHBACK_DATABASE_LOGFILE    1077.00
       V$FAST_START_SERVERS            1027.00

DEPTNO ENAME                               SAL
------ ------------------------------ --------
    27 V$GC_ELEMENTS_WITH_COLLISIONS    977.00

    28 V_$FLASHBACK_DATABASE_LOG       1078.00
       V_$FAST_START_TRANSACTIONS      1028.00
       V_$FILE_CACHE_TRANSFER           978.00

    29 V$FLASHBACK_DATABASE_LOG        1079.00
       V$FAST_START_TRANSACTIONS       1029.00
       V$FILE_CACHE_TRANSFER            979.00

    30 V_$FLASHBACK_DATABASE_STAT      1080.00

DEPTNO ENAME                               SAL
------ ------------------------------ --------
    30 V_$LOCKED_OBJECT                1030.00
       V_$TEMP_CACHE_TRANSFER           980.00

    31 V$FLASHBACK_DATABASE_STAT       1081.00
       V$LOCKED_OBJECT                 1031.00
       V$TEMP_CACHE_TRANSFER            981.00

    32 V_$RESTORE_POINT                1082.00
       V_$LATCH                        1032.00
       V_$CLASS_CACHE_TRANSFER          982.00


DEPTNO ENAME                               SAL
------ ------------------------------ --------
    33 V$RESTORE_POINT                 1083.00
       V$LATCH                         1033.00
       V$CLASS_CACHE_TRANSFER           983.00

    34 V_$ROLLNAME                     1084.00
       V_$LATCH_CHILDREN               1034.00
       V_$BH                            984.00

    35 V$ROLLNAME                      1085.00
       V$LATCH_CHILDREN                1035.00
       V$BH                             985.00

DEPTNO ENAME                               SAL
------ ------------------------------ --------

    36 V_$ROLLSTAT                     1086.00
       V_$LATCH_PARENT                 1036.00
       V_$LOCK_ELEMENT                  986.00

    37 V$ROLLSTAT                      1087.00
       V$LATCH_PARENT                  1037.00
       V$LOCK_ELEMENT                   987.00

    38 V_$UNDOSTAT                     1088.00
       V_$LATCHNAME                    1038.00

DEPTNO ENAME                               SAL
------ ------------------------------ --------
    38 V_$LOCKS_WITH_COLLISIONS         988.00

    39 V$UNDOSTAT                      1089.00
       V$LATCHNAME                     1039.00
       V$LOCKS_WITH_COLLISIONS          989.00

    40 V_$SGA                          1090.00
       V_$LATCHHOLDER                  1040.00
       V_$FILE_PING                     990.00

    41 V$LATCHHOLDER                   1041.00

DEPTNO ENAME                               SAL
------ ------------------------------ --------
    41 V$FILE_PING                      991.00
       V$SQL_OPTIMIZER_ENV              941.00

    42 V_$LATCH_MISSES                 1042.00
       V_$TEMP_PING                     992.00
       V_$DLM_MISC                      942.00

    43 V$LATCH_MISSES                  1043.00
       V$TEMP_PING                      993.00
       V$DLM_MISC                       943.00


DEPTNO ENAME                               SAL
------ ------------------------------ --------
    44 V_$SESSION_LONGOPS              1044.00
       V_$CLASS_PING                    994.00
       V_$DLM_LATCH                     944.00

    45 V$SESSION_LONGOPS               1045.00
       V$CLASS_PING                     995.00
       V$DLM_LATCH                      945.00

    46 V_$RESOURCE                     1046.00
       V_$INSTANCE_CACHE_TRANSFER       996.00
       V_$DLM_CONVERT_LOCAL             946.00

DEPTNO ENAME                               SAL
------ ------------------------------ --------

    47 V$RESOURCE                      1047.00
       V$INSTANCE_CACHE_TRANSFER        997.00
       V$DLM_CONVERT_LOCAL              947.00

    48 V_$_LOCK                        1048.00
       V_$BUFFER_POOL                   998.00
       V_$DLM_CONVERT_REMOTE            948.00

    49 V$_LOCK                         1049.00
       V$BUFFER_POOL                    999.00

DEPTNO ENAME                               SAL
------ ------------------------------ --------
    49 V$DLM_CONVERT_REMOTE             949.00


150 rows selected.

SQL>
SQL> drop table t;

Table dropped.

SQL>

   
    
  
Related examples in the same category
1. A correlated subquery references one or more columns in the outer query
2. Using EXISTS with a Correlated Subquery
3. Using NOT EXISTS with a Correlated Subquery
4. Get Categories and Products (with Correlated Subqueries)
5. A correlated subquery: the subquery references a column from a table referred to in the parent statement.
6. How Many Products By Department with correlated subqueries 2
7. To delete the records of emps whose salary is below the average salary in the department (correlated subquery):
8. To update the salary of all emps to the maximum salary in the corresponding department (correlated subquery):
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