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Specifying of maximal depth for recursive CTE [CORE1290] #1711

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firebird-automations opened this issue May 31, 2007 · 4 comments
Open

Specifying of maximal depth for recursive CTE [CORE1290] #1711

firebird-automations opened this issue May 31, 2007 · 4 comments
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priority: major type: improvement

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Submitted by: Alexander Tyutik (tut)

Votes: 7

It would be nice to enhance syntax of recursive CTE to something like this:

WITH [RECURSIVE [MAX DEEP X]]

Because now we do not have any effective solution for limitation such recursive queries by deep.
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Commented by: @tonal

My bee better construct with explicit recursive exit condition.
Like this:

WITH [RECURSIVE [WHERE <condition>]]

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Modified by: @pcisar

Workflow: jira [ 12240 ] => Firebird [ 15588 ]

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Modified by: @dyemanov

summary: Specifying of maximal deep for recursive CTE => Specifying of maximal depth for recursive CTE

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Commented by: Michał Ziemski (r_o_o_k)

Wouldn't this be sufficient:

WITH RECURSIVE
S AS (SELECT 0 DEPTH, ID
FROM TMP
UNION ALL
SELECT S.DEPTH + 1, http://TMP.ID
FROM TMP
JOIN S ON TMP.PARENT_ID = http://S.ID
WHERE S.DEPTH < 10)
SELECT * FROM S

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