Sql is null or empty Composer = NULL Code language: SQL (Structured Query Language) (sql) It’s not valid to use the NULL this way. with t as ( <your query here> ) select t. Thanks in advance for the help. SQL Query to Select All If Parameter is NULL. Some of the most common NULL functions include IS NULL, IS NOT NULL, NOT NULL, NULL, what is NULL, NULL vs NOT NULL, etc. WHERE p. General Disclaimer: Jan 27, 2017 · It's quite possible that the data is actually an empty string instead of null. Aug 1, 2017 · The problem is likely the comparison to NULL, as explained in David Spillett's answer above. Dec 19, 2024 · Performance considerations for large datasets with NULLs and empty values; Conclusion; NULL and empty values in SQL Server. Expressions (Transact-SQL) IS NULL (Transact-SQL) Summary: in this tutorial, you learn about the NULL and how to use the SQL IS NULL operator to test if a value is NULL or not. rnredsknozptsadsawzvjhmgrpfmryxznotkmfivfijkxqvyjychpwqwdxufedpalfwtyoizwvxgkr