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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:
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For example, SELECT NULLIF(4,4) AS Same, NULLIF(5,7) AS Different; returns NULL for the first column (4 and 4) because the two input values are the same. The second column returns the first value (5) because the two input values are different. Transact-SQL syntax conventions. Syntax NULLIF ( expression , expression ) Arguments. expression
SELECT ISNULL(NULLIF(listing.Offer_Text, ''), company.Offer_Text) AS Offer_Text FROM ... is the most elegant solution. And to break it down a bit in pseudo code:
This tutorial introduces you to the SQL NULLIF function and shows you how to add the if-else condition to your SQL queries.
Using NULLIF expression to translate a blank string to NULL. The NULLIF expression comes in handy when you’re working with legacy data that contains a mixture of null and empty strings in a column. Consider the following example. First, create a new table named sales.leads to store the sales leads:
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.
15 sty 2021 · SQL NULLIF expression compares two expression and returns a null value if the two specified expressions are equal, else it returns the first expression. NULLIF expression is equivalent to a searched CASE expression in which the two expressions are equal and the resulting expression is NULL.
