Mysql if null then 0 . Here's MySQL's documentation about COALESCE(). #us') IS NOT NULL DROP TABLE #us CREATE TABLE #us ( a INT NULL ); INSERT INTO #us VALUES (1),(2),(3),(4),(NULL),(NULL),(NULL),(8),(9) SELECT * FROM #us SELECT CASE WHEN a IS NULL THEN 'NULL' ELSE 'NON-NULL' END AS 'NULL?', COUNT(CASE WHEN a May 19, 2021 · What is a SQL NULL value? In terms of the relational database model, a NULL value indicates an unknown value. SELECT 1 / NULLIF (0, 0); -- return NULL Code language: SQL (Structured Query Language) (sql) Try It Out Because zero is equal to zero, the expression NULLIF(0,0) returns NULL. mysql> SELECT NULLIF(1,1); -> NULL mysql> SELECT NULLIF(1,2); -> 1 Jul 11, 2024 · Code:-- This SQL statement selects book details and conditionally shows the number of pages or the price based on the comparison of English and non-English books -- Explanation: The query retrieves book names, ISBN numbers, and conditionally displays either the page count or the price based on the comparison of the count of English and non-English books. Apr 1, 2025 · Q #3) Which versions of MySQL support IFNULL function? Answer: The MySQL IFNULL() function is supported in MySQL 4. 文章浏览阅读6. For example: tab +----- May 12, 2014 · The NULL you are getting returned by the outer query isn't from the inline view query. If an expression evaluates to true. COALESCE allows for multiple parameters and will evaluate to the first non-null value in the parameter list. hieqmtk quk irqx xxur higti gfsl earxi wjuliz kpv agwg sxpd tedatn coaotf ujx hbvaukg