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15 wrz 2008 · SELECT CASE WHEN <test> THEN <returnvalue> WHEN <othertest> THEN <returnthis> ELSE <returndefaultcase> END AS <newcolumnname> FROM <table> You can even put case statements in an order by clause for really fancy ordering.
28 maj 2024 · For example, we can use IF-THEN logic in an SQL SELECT statement to perform various tasks on data based on specific conditions. 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.
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' See example of second running here
7 gru 2023 · If you want to do if-else-then logic in select, where or anywhere else in a statement, you need a case expression. This is a series of when clauses that the database runs in order: For example, if you want to map exam correct percentages to grade letters according to these rules:
30 paź 2023 · Different methods to use SQL IF Statement in SELECT. CASE Statement: The CASE statement directly introduces conditional logic (if-else) into SELECT statements, allowing different values to be returned based on evaluated conditions.
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.
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 .
