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The NULLIF function will convert any column value with only whitespace into a NULL value. Works for T-SQL and SQL Server 2008 & up. SELECT [column_name] FROM [table_name] WHERE NULLIF([column_name], '') IS NULL
16 wrz 2016 · 1. Use COALESCE which is shorthand for a CASE expression: COALESCE(expression1, expression2, ..., expressionN) is shorthand for. CASE. WHEN (expression1 IS NOT NULL) THEN expression1. WHEN (expression2 IS NOT NULL) THEN expression2. ... ELSE expressionN. END. therefore you can use. SELECT ParentOrderNumber, clientname,
28 maj 2024 · In this article, we explored different options for executing IF-THEN logic in a SQL SELECT statement. These options include using CASE , IIF() , and CHOOSE() . Furthermore, if we want a query that’s used in almost every dialect, we must choose the CASE statement.
31 sty 2018 · CASE WHEN (SELECT 1 WHERE (1=1)) = 1 THEN 1 ELSE 0 END. My subquery is returning one row and hence compared to 1. This leads my CASE WHEN to produce the 1 output. Even if I set the subquery to return no rows like the sample below, the CASE statement returns the 0 result: SELECT.
30 paź 2023 · The SQL IF statement in SELECT queries is utilized to introduce conditional logic, allowing for more dynamic and flexible data retrieval. Essentially, it lets you specify conditions to dictate which data should be fetched or how it should be displayed.
7 mar 2022 · Introduction. 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.
2 cze 2023 · The CASE statement allows you to perform an IF-THEN-ELSE check within an SQL statement. It’s good for displaying a value in the SELECT query based on logic that you have defined. As the data for columns can vary from row to row, using a CASE SQL expression can help make your data more readable and useful to the user or to the application.
