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AND NEW.email !~ '^\s*$'

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Original file line number	Diff line number	Diff line change
`@@ -231,15 +231,18 @@ DROP TRIGGER IF EXISTS person_email_check_insert ON person_email;`
`231`	`231`	`CREATE TRIGGER person_email_check_insert`
`232`	`232`	`BEFORE INSERT ON person`
`233`	`233`	`FOR EACH ROW`
`234`		`- WHEN (NEW.email IS NOT NULL)`
	`234`	`+ WHEN (NEW.email IS NOT NULL`
	`235`	`+ AND NEW.email !~ '^\s*$')`
`235`	`236`	`EXECUTE PROCEDURE person_email_check();`
`236`	`237`
`237`	`238`	`--обновление`
`238`	`239`	`DROP TRIGGER IF EXISTS person_email_check_update ON person_email;`
`239`	`240`	`CREATE TRIGGER person_email_check_update`
`240`	`241`	`BEFORE UPDATE OF email ON person -- поле явно указано в UPDATE запросе!`
`241`	`242`	`FOR EACH ROW`
`242`		`- WHEN (NEW.email IS NOT NULL AND NEW.email IS DISTINCT FROM OLD.email) -- значение изменилось`
	`243`	`+ WHEN (NEW.email IS NOT NULL`
	`244`	`+ AND NEW.email !~ '^\s*$'`
	`245`	`+ AND NEW.email IS DISTINCT FROM OLD.email) -- значение изменилось`
`243`	`246`	`EXECUTE PROCEDURE person_email_check();`
`244`	`247`	```
`245`	`248`

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