Oracle tips and tricks for joins, CASE statements, and more
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The document provides an overview of various Oracle tips and tricks, including CASE statements, joins, timestamps, renaming tables/columns, merge statements, subqueries, window functions, hierarchical queries, XML, grouping sets, rollups and cubes, indexes, temporary tables and more. Key features introduced in Oracle 9i such as the CASE statement, full outer joins, timestamps and the WITH clause are highlighted.
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- 1. Oracle Tips & Tricks Feb 10, 2011 Shane Zhang
- 21. Group By Enhancements – Grouping Set select count(*) CNT, deptno, 'summary' as job from emp group by deptno UNION ALL select count(*), deptno, job from emp group by deptno, job / CNT DEPTNO JOB --- ---------- --------- 3 10 Summary 1 10 PRESIDENT 1 10 MANAGER 1 10 CLERK 5 20 Summary 1 20 MANAGER 2 20 CLERK 2 20 ANALYST 6 30 Summary 4 30 SALESMAN 1 30 MANAGER 1 30 CLERK select count(*) CNT, deptno , CASE GROUPING_ID(job) WHEN 1 THEN 'Summary' ELSE job END AS job from emp group by GROUPING SETS ( (deptno) , (deptno, job ) ) / CNT DEPTNO JOB --- ---------- --------- 3 10 Summary 1 10 PRESIDENT 1 10 MANAGER 1 10 CLERK 5 20 Summary 1 20 MANAGER 2 20 CLERK 2 20 ANALYST 6 30 Summary 4 30 SALESMAN 1 30 MANAGER 1 30 CLERK Union all method, multiple table scan , slow New method, fast
- 24. ROLLUP Example Output SHP_RCV_SRC_CD TNDR_TYPE_CD SUM(A.NBR_OF_PKGS) SUM(A.NET_REV) SUM(A.RATD_WGT) 3 CCC 15204 452297 76297 3 DRPF 688169 12653173 3509281 3 SOLD 570572 8422926 3112950 3 ? 1273945 21528396 6698529 4 CCC 26 1414 100 4 DRPF 484 28301 4350 4 SOLD 759 23706 5306 4 ? 1269 53421 9756 5 CCC 18 975 80 5 DRPF 2123 101847 12510 5 SOLD 230 7026 1625 5 ? 2371 109849 14215 ? ? 1277585 21691666 6722500
- 26. CUBE Example Output SHP_RCV_SRC_CD TNDR_TYPE_CD SUM(A.NBR_OF_PKGS) SUM(A.NET_REV) SUM(A.RATD_WGT) 3 CCC 15204 452297 76297 3 DRPF 688169 12653173 3509281 3 SOLD 570572 8422926 3112950 3 ? 1273945 21528396 6698529 4 CCC 26 1414 100 4 DRPF 484 28301 4350 4 SOLD 759 23706 5306 4 ? 1269 53421 9756 5 CCC 18 975 80 5 DRPF 2123 101847 12510 5 SOLD 230 7026 1625 5 ? 2371 109849 14215 ? CCC 15248 454686 76478 ? DRPF 690776 12783322 3526141 ? SOLD 571561 8453658 3119881 ? ? 1277585 21691666 6722500