Wednesday, December 19, 2007

updates in PostgreSQL, MS SQL, MySQL

PostgreSQL: OK, MS SQL: OK (just change the "||" to "+"), MySQL: NOT OK

/* very orthogonal, since only one table allowed to be updated, no need to "set = ", "set name = " will do. in fact if you do: "set = ", postgres will disallow it */

update product set name = || ':' ||
from prod
where prod.seq_id = product.seq_id


PostgreSQL: OK (good for re-using existing query, must alias the source table if the source table conflicts with to-be-updated-table name), MS SQL: NOT OK, MySQL: NOT OK

update product set name = || ':' ||
from product x
inner join prod on prod.seq_id = x.seq_id
where x.seq_id = product.seq_id /* don't forget to filter the to-be-updated-table to queried rows */



/* note: even only one possible table can be updated, requires the fully-qualified name for the fields to be set. i.e. set */

update product,prod set = concat(, ':',
where prod.seq_id = product.seq_id;


PostgreSQL: NOT OK, MS SQL: OK (good for re-using existing query), MySQL: NOT OK

update product set name = + ':' +
from product /* limitation: cannot alias this, must be same name as the table to-be-updated */
inner join prod on prod.seq_id = product.seq_id



update product join prod on prod.seq_id = product.seq_id

set = concat(, ':',;

/* nice update syntax, not ambiguous as MS SQL. similar to MS Access update join syntax, though not as good/flexible as PostgreSQL, wherein you can just drop-in your previous query to the update statement */


Anonymous Anonymous said...

--postgreSQL(9.0verified) should be:
UPDATE product set name = + ':' +
FROM prod WHERE prod.seq_id = product.seq_id

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