Microsoft Access - Case Query

What is the equivalent of Select Case in Access SQL?

Consider the Switch Function as an alternative to multiple IIf() expressions. It will return the value from the first expression/value pair where the expression evaluates as True, and ignore any remaining pairs. The concept is similar to the SELECT ... CASE approach you referenced but which is not available in Access SQL.

If you want to display a calculated field as commission:

SELECT
    Switch(
        OpeningBalance < 5001, 20,
        OpeningBalance < 10001, 30,
        OpeningBalance < 20001, 40,
        OpeningBalance >= 20001, 50
        ) AS commission
FROM YourTable;

If you want to store that calculated value to a field named commission:

UPDATE YourTable
SET commission =
    Switch(
        OpeningBalance < 5001, 20,
        OpeningBalance < 10001, 30,
        OpeningBalance < 20001, 40,
        OpeningBalance >= 20001, 50
        );

Either way, see whether you find Switch() easier to understand and manage. Multiple IIf()s can become mind-boggling as the number of conditions grows.

MS Access Query with CASE statement

MS Access does not support CASE statements. Use IIF:

IIF(tsl.activitat <> '', tsl.activitat, ts.activitat ) AS Activitat

I'm not sure if Access supports aliases on LEFT JOIN either, but it probably does

Note (although correctly tagged), the title of your question might be troublesome... most people refer to Transact-SQL (TSQL) when writing "MS SQL". Transact-SQL is used by MS SQL Server, but not by MS Access, which uses its own SQL dialect (called "Access SQL", and pretty limited in comparison)

Does MS Access support CASE WHEN clause if connect with ODBC?

You could use IIF statement like in the next example:

SELECT
   IIF(test_expression, value_if_true, value_if_false) AS FIELD_NAME
FROM
   TABLE_NAME

Microsoft Access - Case Query

There is no CASE ... WHEN in Access SQL. You can use the Switch Function instead.

UPDATE HAI
SET REGION = Switch(
    NUMREG Like '*1', 'BDG',
    NUMREG Like '*2', 'JKT',
    NUMREG Like '*3', 'KNG'
    );

That query uses Access' default (ANSI 89 mode) * instead of % wildcard character. If you want to use the % wildcard, you can do it with the ALike comparison operator.

UPDATE HAI
SET REGION = Switch(
    NUMREG ALike '%1', 'BDG',
    NUMREG ALike '%2', 'JKT',
    NUMREG ALike '%3', 'KNG'
    );

Case expressions in Access

You can use the IIF() function instead.

IIF(condition, valueiftrue, valueiffalse)

• condition is the value that you want to test.

• valueiftrue is the value that is returned if condition evaluates to TRUE.

• valueiffalse is the value that is returned if condition evaluates to FALSE.

There is also the Switch function which is easier to use and understand when you have multiple conditions to test:

Switch( expr-1, value-1 [, expr-2, value-2 ] … [, expr-n, value-n ] )

The Switch function argument list consists of pairs of expressions and
values. The expressions are evaluated from left to right, and the
value associated with the first expression to evaluate to True is
returned. If the parts aren't properly paired, a run-time error
occurs. For example, if expr-1 is True, Switch returns value-1. If
expr-1 is False, but expr-2 is True, Switch returns value-2, and so
on.

Switch returns a Null value if:

• None of the expressions is True.

• The first True expression has a corresponding value that is Null.

NOTE: Switch evaluates all of the expressions, even though it returns only one of them. For this reason, you should watch for
undesirable side effects. For example, if the evaluation of any
expression results in a division by zero error, an error occurs.

CASE statement in Access 2013 (and how to use it)?

Thanks for Gord Thompson for giving me a clue, this is what I was looking for, it's working perfect :

expr1: Switch([date_]=Date(),"today",
              [date_]=Date()-1,"yesterday",
              [date_]>Date()-7,"week ago")

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