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Allow the use of multiple WHEN MATCHED / NOT MATCHED clauses in MERGE, as per the SQL 2008 specification [CORE3639] #3990

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firebird-issue-importer opened this issue Oct 20, 2011 · 5 comments

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@firebird-issue-importer

Submitted by: @asfernandes

Votes: 2

Combined with WHEN conditions, this makes MERGE very powerful.

Commits: 9f16366 372d48c FirebirdSQL/fbt-repository@a1a4b7b

====== Test Details ======

Verified that one may use MERGE which contains up to 254 WHEN-conditions (with trivial statements like: when NOT matched and http://s.id = 254 then insert values(http://s.id, s.x) or when matched and http://s.id = 254 then update set t.x = t.x + s.x).

::: NB :::
JFYI: Statement MERGE ... RETURNING will fail always if SOURCE contain more than 1 row. Even if MERGE condition doesn not affected more than one record in TARGET.
Discussion (rus): http://sql.ru/forum/actualutils.aspx?action=gotomsg&tid=1159066&msg=17706227

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firebird-issue-importer commented Oct 20, 2011

Modified by: @asfernandes

assignee: Adriano dos Santos Fernandes [ asfernandes ]

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firebird-issue-importer commented Oct 23, 2011

Modified by: @asfernandes

status: Open [ 1 ] => Resolved [ 5 ]

resolution: Fixed [ 1 ]

Fix Version: 3.0 Alpha 1 [ 10331 ]

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firebird-issue-importer commented May 29, 2015

Modified by: @pavel-zotov

status: Resolved [ 5 ] => Resolved [ 5 ]

QA Status: Done successfully

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firebird-issue-importer commented Jun 1, 2015

Modified by: @pavel-zotov

status: Resolved [ 5 ] => Resolved [ 5 ]

Test Details: Verified that one may use MERGE which contains up to 254 WHEN-conditions (with trivial statements like: when NOT matched and http://s.id = 254 then insert values(http://s.id, s.x) or when matched and http://s.id = 254 then update set t.x = t.x + s.x).

::: NB :::
JFYI: Statement MERGE ... RETURNING will fail always if SOURCE contain more than 1 row. Even if MERGE condition doesn not affected more than one record in TARGET.
Discussion (rus): http://sql.ru/forum/actualutils.aspx?action=gotomsg&tid=1159066&msg=17706227

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firebird-issue-importer commented Jun 1, 2015

Modified by: @pavel-zotov

status: Resolved [ 5 ] => Closed [ 6 ]

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