May 2017
Beginner
416 pages
10h 37m
English
Content preview from Mastering PostgreSQL 9.6
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Supporting FETCH FIRST clause
The following list shows which engines support FETCH FIRST clause and which don't:
- MariaDB: Since 5.1 (usually, limit/offset is used)
- MySQL: Since 3.19.3 (usually, limit/offset is used)
- PostgreSQL: Since PostgreSQL 8.4 (usually, limit/offset is used)
- SQLite: Since version 2.1.0
- DB2 LUW: Since version 7
- Oracle: Since version 12c (used subselects with row_num finction)
- MS SQL Server: Since 2012 (traditionally top-N is used)
As you can see, limiting result sets is quite tricky, and when you are porting a commercial database to PostgreSQL, you will most likely always be confronted with some proprietary syntax.
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