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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
26 mar 2012 · You need the ISNULL function. SELECT ISNULL (a, b) b gets selected if a is null. Also, you can use the WHEN/THEN select option, lookup in BOL. Essentially: its c switch/case block meets SQL. edited Jun 23, 2019 at 12:21. answered Mar 26, 2012 at 19:36.
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.
select sum(case when Column_1 is null then 1 else 0 end) as Column_1, sum(case when Column_2 is null then 1 else 0 end) as Column_2, sum(case when Column_3 is null then 1 else 0 end) as Column_3, from TestTable
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.
31 sty 2024 · 1. IS NULL. This key word returns any records with NULL value in the column specified in a Table. Syntax: WHERE {COLUMN NAME} IS NULL. Example: Select * from StudentsInfo . WHERE ContactPhone IS NULL. The above query checks for null values in the column ‘ContactPhone‘ from ‘StudenetsInfo‘ table. Below is the output. Output: IS NULL example output.
The IF statement for stored programs implements a basic conditional construct. There is also an IF ()function, which differs from the IFstatement described here. See Section 14.5, “Flow Control Functions”. The IF statement can have THEN, ELSE, and ELSEIF clauses, and it is terminated with END IF. If a given search_condition evaluates to ...
