97 lines
7.1 KiB
Plaintext
97 lines
7.1 KiB
Plaintext
SELECT /*+ GATHER_PLAN_STATISTICS QB_NAME(main) */ employees.*
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FROM HR.employees,
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( SELECT /*+ QB_NAME(iv1) */
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trunc(hire_date, 'YYYY'), MAX(employee_id) employee_id
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FROM HR.employees
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GROUP BY trunc(hire_date, 'YYYY')) x
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WHERE employees.employee_id=x.employee_id
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/
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EMPLOYEE_ID FIRST_NAME LAST_NAME EMAIL PHONE_NUMBER HIRE_DATE JOB_ID SALARY MANAGER_ID DEPARTMENT_ID
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----------- -------------------- ------------------------- ------------------------- -------------------- ------------------- ---------- ---------- ---------- -------------
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206 William Gietz WGIETZ 515.123.8181 2002-06-07 00:00:00 AC_ACCOUNT 8300 205 110
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102 Lex De Haan LDEHAAN 515.123.4569 2001-01-13 00:00:00 AD_VP 17000 100 90
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197 Kevin Feeney KFEENEY 650.507.9822 2006-05-23 00:00:00 SH_CLERK 3000 124 50
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201 Michael Hartstein MHARTSTE 515.123.5555 2004-02-17 00:00:00 MK_MAN 13000 100 20
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199 Douglas Grant DGRANT 650.507.9844 2008-01-13 00:00:00 SH_CLERK 2600 124 50
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200 Jennifer Whalen JWHALEN 515.123.4444 2003-09-17 00:00:00 AD_ASST 4400 101 10
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198 Donald OConnell DOCONNEL 650.507.9833 2007-06-21 00:00:00 SH_CLERK 2600 124 50
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202 Pat Fay PFAY 603.123.6666 2005-08-17 00:00:00 MK_REP 6000 201 20
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8 rows selected.
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--------------------------------------------------------------------------------------------------------------------------------------------------------
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| Id | Operation | Name | Starts | E-Rows |E-Bytes| Cost (%CPU)| A-Rows | A-Time | Buffers | OMem | 1Mem | Used-Mem |
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--------------------------------------------------------------------------------------------------------------------------------------------------------
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| 0 | SELECT STATEMENT | | 1 | | | 4 (100)| 8 |00:00:00.01 | 19 | | | |
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| 1 | NESTED LOOPS | | 1 | 107 | 15622 | 4 (25)| 8 |00:00:00.01 | 19 | | | |
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| 2 | NESTED LOOPS | | 1 | 107 | 15622 | 4 (25)| 8 |00:00:00.01 | 11 | | | |
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| 3 | VIEW | | 1 | 107 | 1391 | 4 (25)| 8 |00:00:00.01 | 7 | | | |
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| 4 | HASH GROUP BY | | 1 | 107 | 2354 | 4 (25)| 8 |00:00:00.01 | 7 | 1116K| 1116K| 894K (0)|
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| 5 | TABLE ACCESS FULL | EMPLOYEES | 1 | 107 | 2354 | 3 (0)| 107 |00:00:00.01 | 7 | | | |
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|* 6 | INDEX UNIQUE SCAN | EMP_EMP_ID_PK | 8 | 1 | | 0 (0)| 8 |00:00:00.01 | 4 | | | |
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| 7 | TABLE ACCESS BY INDEX ROWID| EMPLOYEES | 8 | 1 | 133 | 0 (0)| 8 |00:00:00.01 | 8 | | | |
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--------------------------------------------------------------------------------------------------------------------------------------------------------
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Query Block Name / Object Alias (identified by operation id):
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-------------------------------------------------------------
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1 - MAIN
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3 - IV1 / X@MAIN
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4 - IV1
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5 - IV1 / EMPLOYEES@IV1
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6 - MAIN / EMPLOYEES@MAIN
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7 - MAIN / EMPLOYEES@MAIN
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Predicate Information (identified by operation id):
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---------------------------------------------------
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6 - access("EMPLOYEES"."EMPLOYEE_ID"="X"."EMPLOYEE_ID")
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SELECT /*+ GATHER_PLAN_STATISTICS QB_NAME(iv1) */
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trunc(hire_date, 'YYYY'), MAX(employee_id) employee_id
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FROM HR.employees
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GROUP BY trunc(hire_date, 'YYYY')
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/
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TRUNC(HIRE_DATE,'YY EMPLOYEE_ID
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------------------- -----------
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2002-01-01 00:00:00 206
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2001-01-01 00:00:00 102
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2006-01-01 00:00:00 197
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2004-01-01 00:00:00 201
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2008-01-01 00:00:00 199
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2003-01-01 00:00:00 200
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2007-01-01 00:00:00 198
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2005-01-01 00:00:00 202
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8 rows selected.
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------------------------------------------------------------------------------------------------------------------------------------------
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| Id | Operation | Name | Starts | E-Rows |E-Bytes| Cost (%CPU)| A-Rows | A-Time | Buffers | OMem | 1Mem | Used-Mem |
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------------------------------------------------------------------------------------------------------------------------------------------
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| 0 | SELECT STATEMENT | | 1 | | | 4 (100)| 8 |00:00:00.01 | 7 | | | |
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| 1 | HASH GROUP BY | | 1 | 107 | 2354 | 4 (25)| 8 |00:00:00.01 | 7 | 1116K| 1116K| 892K (0)|
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| 2 | TABLE ACCESS FULL| EMPLOYEES | 1 | 107 | 2354 | 3 (0)| 107 |00:00:00.01 | 7 | | | |
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------------------------------------------------------------------------------------------------------------------------------------------
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--------------------------------------------------------------------------------------------------------------------------------------------------------
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| Id | Operation | Name | Starts | E-Rows |E-Bytes| Cost (%CPU)| A-Rows | A-Time | Buffers | OMem | 1Mem | Used-Mem |
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--------------------------------------------------------------------------------------------------------------------------------------------------------
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| 0 | SELECT STATEMENT | | 1 | | | 4 (100)| 8 |00:00:00.01 | 19 | | | |
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| 1 | NESTED LOOPS | | 1 | 107 | 15622 | 4 (25)| 8 |00:00:00.01 | 19 | | | |
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| 2 | NESTED LOOPS | | 1 | 107 | 15622 | 4 (25)| 8 |00:00:00.01 | 11 | | | |
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| 3 | VIEW | | 1 | 107 | 1391 | 4 (25)| 8 |00:00:00.01 | 7 | | | |
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|* 6 | INDEX UNIQUE SCAN | EMP_EMP_ID_PK | 8 | 1 | | 0 (0)| 8 |00:00:00.01 | 4 | | | |
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| 7 | TABLE ACCESS BY INDEX ROWID| EMPLOYEES | 8 | 1 | 133 | 0 (0)| 8 |00:00:00.01 | 8 | | | |
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--------------------------------------------------------------------------------------------------------------------------------------------------------
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