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Diffstat (limited to 'docs/databases/postgres.txt')
| -rw-r--r-- | docs/databases/postgres.txt | 12 |
1 files changed, 12 insertions, 0 deletions
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 |