From ea365994a9bc5505490b1d72a228a42e4526ef31 Mon Sep 17 00:00:00 2001
From: asos-martinsmith <101659886+asos-martinsmith@users.noreply.github.com>
Date: Sat, 25 Jan 2025 12:08:14 +0000
Subject: [PATCH] Update between-transact-sql.md

The statement that if any part is `NULL` the overall expression evaluates to `UNKNOWN` is not correct.

Counter example

```
SELECT 1
WHERE NOT 2 BETWEEN NULL AND 1
```

Because that is equivalent to

```
2  >= NULL  AND 2  <= 1
```

or

```
UNKNOWN  AND FALSE
```

Which is `FALSE`
---
 docs/t-sql/language-elements/between-transact-sql.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/docs/t-sql/language-elements/between-transact-sql.md b/docs/t-sql/language-elements/between-transact-sql.md
index 735b02c78bf..2659570751f 100644
--- a/docs/t-sql/language-elements/between-transact-sql.md
+++ b/docs/t-sql/language-elements/between-transact-sql.md
@@ -61,7 +61,8 @@ test_expression [ NOT ] BETWEEN begin_expression AND end_expression
  NOT BETWEEN returns **TRUE** if the value of *test_expression* is less than the value of *begin_expression* or greater than the value of *end_expression*.  
   
 ## Remarks  
- To specify an exclusive range, use the greater than (>) and less than operators (<). If any input to the BETWEEN or NOT BETWEEN predicate is NULL, the result is UNKNOWN.  
+ To specify an exclusive range, use the greater than (>) and less than operators (<). If any input to the BETWEEN or NOT BETWEEN predicate is NULL, the result depends on the results of the constituent parts.  
+`test_expression >= begin_expression AND test_expression  <= end_expression`. If either part is FALSE then the overall BETWEEN expression evaluates to FALSE. Otherwise the expression will evaluate to UNKNOWN.
   
 ## Examples