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Update docs/en/sql-reference/dictionaries/external-dictionaries/external-dicts-dict-lifetime.md

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Co-authored-by: olgarev <56617294+olgarev@users.noreply.github.com>
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Evgenia Sudarikova 2021-06-24 12:53:39 +03:00 committed by GitHub
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@ -92,7 +92,7 @@ It is also possible for `Flat`, `Hashed`, `ComplexKeyHashed` dictionaries to onl
- If the source is HTTP then `update_field` will be added as a query parameter with the last update time as the parameter value.
- If the source is Executable then `update_field` will be added as an executable script argument with the last update time as the argument value.
- If the source is ClickHouse, MySQL, PostgreSQL, ODBC there will be an additional part of WHERE, where `update_field` is compared as greater or equal with the last update time.
- If the source is ClickHouse, MySQL, PostgreSQL, ODBC there will be an additional part of `WHERE`, where `update_field` is compared as greater or equal with the last update time.
If `update_field` option is set, additional option `update_lag` can be set. Value of `update_lag` option is subtracted from previous update time before request updated data.