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I made an application to collect data from users. Those data will be collected at different places and from these places will be sent to a central server. I need to design a validation plan for the central server in PostgreSQL. Data must be checked against various validations and if a validation fails a message must be thrown.
It is database to database transfer validation.
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Type \q and then press ENTER to quit psql . As of PostgreSQL 11, the keywords " quit " and " exit " in the PostgreSQL command-line interface have been included to help make it easier to leave the command-line tool.
The syntax to drop a primary key in PostgreSQL is: ALTER TABLE table_name DROP CONSTRAINT constraint_name; table_name. The name of the table to modify.
To find the name of a constraint in PostgreSQL, use the view pg_constraint in the pg_catalog schema. Join the view pg_catalog. pg_constraint with the view pg_class ( JOIN pg_class t ON t. oid = c.
The syntax for creating a unique constraint using an ALTER TABLE statement in PostgreSQL is: ALTER TABLE table_name ADD CONSTRAINT constraint_name UNIQUE (column1, column2, ... column_n); table_name.
Yes you're on the right track, you'll either use triggers and/or check constraints to do this.
Also, PostgresQL has a very flexible type system. Make sure to select the most appropriate, restrictive types. You can even define custom types yourself.
UNIQUE constraintsCHECK ConstraintsFOREIGN KEY constraints - tutorial
RAISE EXCEPTION to abort a transaction.EXCLUSION constraints in 9.2 and newerPRIMARY KEYsUNIQUE indexesNote that instead of using varchar(length) you're usually better off using text and a check constraint.
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