Re: [HACKERS] NULL OR ZERO
On Feb 3, 2008 7:41 PM, Jaime Casanova [EMAIL PROTECTED] wrote: On Feb 3, 2008 7:26 PM, Omar Bettin [EMAIL PROTECTED] wrote: Probably I am on the wrong place but for me NULL on numbers means 0 or ZERO. I know about standards... NULL means unknown value, ZERO is a known value NULL represents absence of a value. You get the UNKNOWN truth value if you compare NULL with any data value or another NULL (damn you, 3VL!). ---(end of broadcast)--- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
Re: [HACKERS] NULL OR ZERO
Hello, Omar Bettin wrote: Probably I am on the wrong place but for me NULL on numbers means 0 or ZERO. I know about standards... You can easily convert NULLs to 0 in your queries - read about COALESCE function http://www.postgresql.org/docs/8.0/interactive/functions-conditional.html. Compare these SELECTs: CREATE TABLE test (num INTEGER); INSERT INTO test VALUES (1), (2), (null), (3), (null), (4), (0); SELECT num FROM test; SELECT COALESCE(num, 0) FROM test; but I think that integralism is somewhat wrong. Omar a programmer... ---(end of broadcast)--- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match -- Andrei Kovalevski PostgreSQL Replication, Consulting, Custom Development, 24x7 support Managed Services, Shared and Dedicated Hosting Co-Authors: plPHP, ODBCng - http://www.commandprompt.com/ ---(end of broadcast)--- TIP 6: explain analyze is your friend
Re: [HACKERS] NULL OR ZERO
On Feb 3, 2008 7:26 PM, Omar Bettin [EMAIL PROTECTED] wrote: Probably I am on the wrong place but for me NULL on numbers means 0 or ZERO. I know about standards... NULL means unknown value, ZERO is a known value -- regards, Jaime Casanova Programming today is a race between software engineers striving to build bigger and better idiot-proof programs and the universe trying to produce bigger and better idiots. So far, the universe is winning. Richard Cook ---(end of broadcast)--- TIP 7: You can help support the PostgreSQL project by donating at http://www.postgresql.org/about/donate
[HACKERS] NULL OR ZERO
Probably I am on the wrong place but for me NULL on numbers means 0 or ZERO. I know about standards... but I think that integralism is somewhat wrong. Omar a programmer... ---(end of broadcast)--- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
