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INSERT FROM SELECT
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INSERT FROM SELECT
Read Committed is the default isolation level in PostgreSQL.
...
SELECT query (without a FOR UPDATE/SHARE clause) sees only data committed before the query began; it never sees either uncommitted data or changes committed during query execution by concurrent transactions. In effect, a SELECT query sees a snapshot of the database as of the instant the query begins to run.
...
Also note that two successive SELECT commands can see different data, even though they are within a single transaction, if other transactions commit changes after the first SELECT starts and before the second SELECT starts.
Единый SELECT из А в В увидит то, что было на момент его запуска.AR
Read Committed is the default isolation level in PostgreSQL.
...
SELECT query (without a FOR UPDATE/SHARE clause) sees only data committed before the query began; it never sees either uncommitted data or changes committed during query execution by concurrent transactions. In effect, a SELECT query sees a snapshot of the database as of the instant the query begins to run.
...
Also note that two successive SELECT commands can see different data, even though they are within a single transaction, if other transactions commit changes after the first SELECT starts and before the second SELECT starts.
Единый SELECT из А в В увидит то, что было на момент его запуска.ВС
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json -> ‘key1’ ->> ‘key2’ IS NULL
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INSERT FROM SELECT