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|Comment:||Add documentaion on the reverse_unordered_selects pragma.|
|Timelines:||family | ancestors | descendants | both | trunk|
|Files:||files | file ages | folders|
|User & Date:||drh 2009-02-23 17:59:52|
|18:14||Added the beginnings of a change log for version 3.6.12. check-in: c926b561a2 user: drh tags: trunk|
|17:59||Add documentaion on the reverse_unordered_selects pragma. check-in: 06452075a4 user: drh tags: trunk|
|16:52||Typo: change "what" to "want" in limits.html. check-in: 4c0e0cc065 user: drh tags: trunk|
Changes to pages/pragma.in.
488 488 between connections that share a common page and schema cache. 489 489 Cache sharing is enabled using the [sqlite3_enable_shared_cache()] API. 490 490 Cache sharing is disabled by default. 491 491 </p> 492 492 493 493 <p>See [SQLite Shared-Cache Mode] for additional information.</p> 494 494 </li> 495 + 496 +<tcl>Subsection reverse_unordered_selects</tcl> 497 +<li><p><b>PRAGMA reverse_unordered_selects = </b><i>0 | 1</i><b>;</b></p> 498 + <p>When enabled, this PRAGMA causes [SELECT] statements without a 499 + an ORDER BY clause to emit their results in the reverse order of what 500 + they normally would. This can help debug applications that are 501 + making invalid assumptions about the result order.<p>SQLite makes no 502 + guarantees about the order of results if a SELECT omits the ORDER BY 503 + clause. Even so, the order of results does not change from one 504 + run to the next, and so many applications mistakenly come to depend 505 + on the arbitrary output order whatever that order happens to be. However, 506 + sometimes new versions of SQLite will contain optimizer enhancements 507 + that will cause the output order of queries without ORDER BY clauses 508 + to shift. When that happens, applications that depend on a certain 509 + output order might malfunction. By running the application multiple 510 + times with this pragma both disabled and enabled, cases where the 511 + application makes faulty assumptions about output order can be 512 + identified and fixed early, reducing problems 513 + that might be caused by linking against a different version of SQLite. 514 + </p> 515 +</li> 495 516 496 517 <tcl>Subsection short_column_names</tcl> 497 518 <li><p><b>PRAGMA short_column_names; 498 519 <br>PRAGMA short_column_names = </b><i>0 | 1</i><b>;</b></p> 499 520 <p>Query or change the short-column-names flag. This flag affects 500 521 the way SQLite names columns of data returned by [SELECT] statements 501 522 when the expression for the column is a table-column name or the