From ca32f08966f1b51fcb19460f0996bb0c4048e6fe Mon Sep 17 00:00:00 2001 From: Pierre Schmitz Date: Sat, 3 Dec 2011 13:29:22 +0100 Subject: Update to MediaWiki 1.18.0 * also update ArchLinux skin to chagnes in MonoBook * Use only css to hide our menu bar when printing --- docs/databases/postgres.txt | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'docs/databases') diff --git a/docs/databases/postgres.txt b/docs/databases/postgres.txt index cec51861..6b266a6a 100644 --- a/docs/databases/postgres.txt +++ b/docs/databases/postgres.txt @@ -92,6 +92,18 @@ in maintenance/tables.sql itself, as it is very strict in the format it expects things to be in. :) +== MySQL differences == + +The major differences between MySQL and Postgres are represented as +methods in the Database class. For example, implicitGroupby() is +true for MySQL and false for Postgres. This means that in those +places where the code does not add all the non-aggregate items +from the SELECT clause to the GROUP BY, we can add them in, but in +a conditional manner with the above method, as simply adding them +all in to the main query may cause performance problems with +MySQL. + + == Getting help == In addition to the normal venues (MediaWiki mailing lists -- cgit v1.2.2