In your case, the "status" is nullable. You can get all the results back by using:
select * from TEST1 where "status" != 'deleted' or "status" is null; Alicia From: Sergey Belousov <sergey.belou...@gmail.com<mailto:sergey.belou...@gmail.com>> Reply-To: "user@phoenix.apache.org<mailto:user@phoenix.apache.org>" <user@phoenix.apache.org<mailto:user@phoenix.apache.org>> Date: Thursday, May 21, 2015 at 5:45 AM To: "user@phoenix.apache.org<mailto:user@phoenix.apache.org>" <user@phoenix.apache.org<mailto:user@phoenix.apache.org>> Subject: Re: WHERE filter on VARCHAR Because NULL is not equal != 'deleted'. Most databases I worked with treat null in such way (behaviour can be configured) use http://phoenix.apache.org/language/functions.html#coalesce In the ANSI SQL standard, the value of NULL is defined as unknown. It is not equal to anything, not even another NULL value. Also, a null value is never not equal to another value. By default, T-SQL adopts the same behavior, but it can be turned off using the SET ANSI_NULLS OFFcommand or setting the database ANSI_NULLS option. In addition, certain database operations cannot or should not be performed if ANSI_NULLS is turned off. Therefore, it is safest to make all T-SQL code ANSI compliant. http://www.hpenterprisesecurity.com/vulncat/en/vulncat/sql/code_correctness_erroneous_null_comparison_tsql.html On Thu, May 21, 2015 at 7:37 AM, Anirudha Khanna <akha...@marinsoftware.com<mailto:akha...@marinsoftware.com>> wrote: Hi All, Have a question regarding a Where clause filter on a string(varchar) column. My table is as follows, CREATE TABLE IF NOT EXISTS TEST1 ( "id" UNSIGNED_LONG NOT NULL, "status" VARCHAR, CONSTRAINT "pk_1" PRIMARY KEY ("id")) VERSIONS = 2; The table is populated to look like, 0: jdbc:phoenix:localhost> select * from TEST1; +-----+----------+ | id | status | +-----+----------+ | 1 | live | | 2 | deleted | | 3 | | <-- row has status == NULL +-----+----------+ Now if I want all the rows that do not have status as deleted, I use the query, select * from TEST1 where "status" != 'deleted'; But this returns me only 1 row, 0: jdbc:phoenix:localhost> select * from TEST1 where "status" != 'deleted'; +-----+---------+ | id | status | +-----+---------+ | 1 | live | +-----+---------+ Why is the row with a NULL status being filtered out? Help appreciated. Cheers, Anirudha
