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9 mar 2011 · For example: sql = r""" SELECT field1, field2, field3, field4 FROM table WHERE condition1 = 1 AND condition2 = 2; """. This is recommended when your query has any special character like '\' which requires escaping and lint tools like flake8 reports it as error. edited Jan 27, 2021 at 6:08.
You would use the SQL NULLIF function when you want to replace a value with NULL in your query result if it matches a specified condition. NULLIF is particularly useful when you need to handle equality as a distinct case, such as when you want to hide or suppress certain results in your query.
Example. Compare two expressions: SELECT NULLIF(25, 25); Try it Yourself » 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:
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.
SQL NULLIF examples. The following statement returns NULL because 100 is equal to 100. SELECT NULLIF (100, 100); Code language: SQL (Structured Query Language) (sql) The following statement returns 100 because 100 is less than 200, the NULLIF function returns the first argument which is 100.
8 maj 2022 · The NULLIF() function is basically a syntactical shortcut for the CASE expression. So for example, we could replace the previous example with the following: SELECT Name, LocalName FROM country WHERE Region = 'South America' AND (CASE WHEN LocalName = Name THEN NULL ELSE LocalName END) IS NOT NULL ORDER BY Name; Result:
6 cze 2024 · We can use the function NULLIF to compare and check if the column contains null or empty values: SELECT id, name FROM Department WHERE NULLIF(TRIM(code), '') IS NULL; The NULLIF function evaluates its two arguments, returning NULL if they are equal.
