You are going to need a procedural language function. There are several
to choose from, they all support some kind of conditional loop. There
is plenty of documentation avaiable at postgresql.org.
Philip Boonzaaier wrote:
>I want to be able to generate SQL statements that will go through a list of
>data, effectively row by row, enquire on the database if this exists in the
>selected table- If it exists, then the colums must be UPDATED, if not, they
>must be INSERTED.
>
>Logically then, I would like to SELECT * FROM <TABLE>
>WHERE ....<Values entered here>, and then IF FOUND
>UPDATE <TABLE> SET .... <Values entered here> ELSE
>INSERT INTO <TABLE> VALUES <Values entered here>
>END IF;
>
>The IF statement gets rejected by the parser. So it would appear that
>PostgreSQL does not support an IF in this type of query, or maybe not at
>all.
>
>Does anyone have any suggestions as to how I can achieve this ?
>
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