SELECT Operator

Selects specific records from input (SELECT Operator) Example

SELECT Operator Tutorial   

Scenario -Select the first two records for each different value in the sorting criteria.

INPUT - MATEPK.INPUT.PSFILE

----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
001  PAWAN         MAINFRAME           JPM       AP        IN
002  SRINIVAS      TESTING             ORACLE    TG        IN
003  SRIDHAR       SAS                 CG        OR        US
004  VENKATESH     ABAP                CSC       CA        IN
005  RAVI          HADOOP              CTS       FL        US
006  PRASAD        HR                  INFOSYS   MI        US
007  RAJA          TESTING             IBM       CA        US

JCL -

----+----1----+----2----+----3----+----4----+----5----+
//MATEPKS  JOB (123),'MATEPK',CLASS=A,MSGCLASS=A,
//             MSGLEVEL=(1,1),NOTIFY=&SYSUID
//*
//STEP01   EXEC PGM=ICETOOL
//INDD     DD DSN=MATEPK.INPUT.PSFILE,DISP=SHR
//OUTDD    DD DSN=MATEPK.OUTPUT.PSFILES,
//            DISP=(NEW,CATLG,DELETE),VOLUME=SER=DEVHD4,
//            SPACE=(TRK,(1,1),RLSE),UNIT=SYSDA,
//            DCB=(DSORG=PS,RECFM=FB,LRECL=80,BLKSIZE=800)
//TOOLIN   DD *
  SELECT FROM(INDD) TO(OUTDD) ON(60,2,CH) FIRST(2)
/*
//TOOLMSG  DD SYSOUT=*
//DFSMSG   DD SYSOUT=*
//

OUTPUT - MATEPK.OUTPUT.PSFILES

----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
001  PAWAN         MAINFRAME           JPM       AP        IN
002  SRINIVAS      TESTING             ORACLE    TG        IN 
003  SRIDHAR       SAS                 CG        OR        US
005  RAVI          HADOOP              CTS       FL        US

TOOLMSG (SDSF SPOOL) - Verify TOOLMSG for the return code of the submitted job.

SELECT TOOLMSG

Explaining Example -

  • INDD - Specifies the ddname for input file.
  • OUTDD - Specifies the ddname for output file.
  • TOOLIN DD * - Specifies the ICETOOL statements for DFSORT.
  • TOOLMSG - Specifies where to write the ICETOOL processing messages.
  • DFSMSG - Specifies where to write the DFSORT processing messages.
  • SELECT FROM(INDD) TO(OUTDD1) ON(60,2,CH) FIRST(2) - Selects the first two records for each individual key(2 character length from 60th position) specified in the criteria.