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15 wrz 2008 · Once you figure out how it works, you can convert three results to two results by deciding the behavior of null. E.g. this would treat null as not saleable: SELECT CASE WHEN obsolete = 'N' OR instock = 'Y' THEN 'true' ELSE 'false' -- either false or null END AS saleable. Share.
28 maj 2024 · However, there is no direct way to use IF-THEN logic in SQL because there is no IF keyword in SQL. We can use either a CASE statement or an IIF() function to implement IF-THEN logic in SQL. In this tutorial, we’ll explore how to implement IF-THEN logic in SQL across various dialects such as SQL Server, MySQL, and PostgreSQL. 2. Using CASE
SELECT CASE WHEN ColB = 'March' THEN (Select ColA FROM tablename WHERE ColB = 'January') END FROM tablename Or can be done without a CASE would be SELECT (SELECT colA FROM tablename WHERE colB = 'January') FROM tablename WHERE colB = 'March'
30 paź 2023 · It can be combined with other functions to mimic an SQL if statement in select, enabling you to specify various outcomes and choose among them based on a specified condition or index, thus making it possible to render results based on conditional logic directly within a SELECT statement.
4 sie 2024 · SELECT column1, column2 FROM table_name WHERE IF(condition, true_value, false_value) = 'desired_value'; Moreover, we can provide three arguments to both functions, including the condition to execute, the return value if the condition is TRUE , and the value to return if the condition is FALSE .
7 mar 2022 · In some cases, you might want to choose the output value based on column values directly in your SQL statement. In this article, we will explain how to use the CASE expression in SELECT SQL statements. We will also explain how to use an alternative approach with an IF clause for MySQL.
18 sty 2024 · CONTAINS is a SQL Server function to search for a word or phrase in one or more text columns using precise or fuzzy matching. Specifically, SQL CONTAINS is a predicate to use in the WHERE clause to perform full-text search. The column or columns to search in must be of character-based data types. Also, they must be full-text indexed columns.
