# SQL SERVER – SQL Puzzle of SET ANSI_NULL – Win USD 50 worth Amazon Gift Cards and Bubble Copter R/C

Note: This contest is over, so enjoy the brain teaser about ANSI_NULL. We all love puzzles and here is interesting puzzle which you can play with me and win Amazon Gift Cards and Bubble Copter R/C. The contest for Amazon Gift Card is open worldwide, however, Bubble Copter winner will be chosen from USA only.

First run following script:

```SET ANSI_NULLS ON;
-- Query1
SELECT 'SQLAuthority' AS Statement11
WHERE 'Authority' IN ('S','Q', 'L', 'Authority', NULL);
-- Query 2
SELECT 'SQLAuthority' AS Statement12
WHERE 'Authority' NOT IN ('S','Q', 'L', NULL);
```

You will get the following result:

You can clearly see that in the first case we are getting different results. Here are the questions you need to answer to win the Amazon Gift Cards and Bubble Copter R/C.

There are two steps to take participate in the contest:

### Step 1: Answer the Question

Question: Why do Query 1 return results but Query 2 does not return any result?

Answer this question in comments area along with the question in Step2.

### Giveaway:

• 2 lucky winners will get USD 25 worth Amazon Gift Card (Open worldwide, Total giveaway value USD 50)
• One lucky winner from USA will get  Bubble Copter R/C (Shipping from USA to other countries is not possible)

### Rules and Conditions:

• Contest open till May 25, 2013 12:00 GMT.
• Please note that winner will be selected after May 25th by random selection and will be posted as a comment to this blog.
• The answers will be kept hidden till the winner will be announced to have fair competition.

Reference: Pinal Dave (https://blog.sqlauthority.com)

## SQL SERVER – Display Rupee Symbol in SSMS

• mycreativelabs
May 23, 2013 2:41 pm

When SET ANSI_NULLS is ON, a SELECT statement that uses WHERE column_name = NULL returns zero rows even if there are null values in column_name. A SELECT statement that uses WHERE column_name NULL returns zero rows even if there are nonnull values in column_name

• Looks like open/close brackets were taken out.

1. Query1 evaluates { where ‘Authority’ = ‘S’ OR ‘Authority’ = ‘Q’ OR ‘Authority’ = ‘L’ OR ‘Authority’ = ‘Authority’ } Since the last condition is true it returns true.

Query2 evaluates { where ‘Authority’ != ‘S’ OR ‘Authority’ != ‘Q’ OR ‘Authority’ != ‘L’ OR ‘Authority’ != null } Since ansi_nulls is turned on ‘Authority’ != null is unknown, so it evaluates to unknown and you get zero rows.

With Ansi_nulls on all comparisons against a null value evaluate to Unknown.

2. 11686.108398 Kilobyte

This was a fun exercise. Thanks for posting it :)

• Hi All,

The winners have been chosen based on the randomly from the correct answers.

Follwing winners will each get USD 25 Amazon Cards
Chandrika

The winner of the RC Chopper has been informed using email. The name of the winner will be announced here once he/she is validated for US Residency.

• Hi Pinal,

Thank you so much. You know I’m very excited to get this prize….