Implement remaining Update_Actions for update_database_table.
#7035
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GregoryTravis
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Jun 14, 2023
jdunkerley
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Jun 15, 2023
| They key columns must be present under the same name in both tables. | ||
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| This will usually be a query of the form | ||
| `DELETE FROM target WHERE (key_columns...) NOT IN (SELECT key_columns... FROM source)`. |
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I wonder if a DELETE/JOIN would work better.
Add a constant marker to the source, and then something like:
DELETE target
FROM target
LEFT JOIN source ON ...
WHERE source.marker is NULLThere was a problem hiding this comment.
This kind of syntax seems to not be supported in neither of the DBs we currently have.
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In SQLite the DELETE syntax only allows for a WHERE clause, no joins are available.
In Postgres, I guess we may try to play with MERGE but that is for a later ticket, I think - so to be revisited in #7036
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Pull Request Description
Closes #6498
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