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14 maj 2009 · SELECT COALESCE(dividend / NULLIF(divisor,0), 0) FROM sometable NULLIF(divisor,0) will return NULL if divisor is 0. In SQL, dividing by NULL returns NULL. The COALESCE function will then replaces the resulting NULL with 0.
Definition and Usage. The NULLIF () function returns NULL if two expressions are equal, otherwise it returns the first expression. Syntax. NULLIF (expr1, expr2) Parameter Values. Technical Details. More Examples. Example. Compare two expressions: SELECT NULLIF('Hello', 'Hello'); Try it Yourself » Example. Compare two expressions:
NULLIF is equivalent to a searched CASE expression in which the two expressions are equal and the resulting expression is NULL. We recommend that you not use time-dependent functions, such as RAND(), within a NULLIF function.
12 gru 2016 · For example, today, I am pasting the SQL output into an Excel spreadsheet, and two of the cells in column "A" in Excel contain no value. But when I look at the copied data in Excel, there definitely is a value in column A. There are a number of other similar copying errors.
This tutorial introduces you to the SQL NULLIF function and shows you how to add the if-else condition to your SQL queries.
The SQL NULLIF function is used to compare two expressions or values and return NULL if they are equal. It provides a way to handle specific cases where you want to treat equality as a special condition by substituting it with a NULL value.
27 paź 2016 · The syntax for the NULLIF function is: NULLIF(value1, value2) For example: SELECT NULLIF(1, 1); NULL. and. SELECT NULLIF(1, 0); 1. This is sugar syntax for the following CASE statement: CASE. WHEN value1 = value2. THEN NULL. ELSE value1. END. Now, let’s take a look at some usage examples for the NULLIF function.
