How to Replace T-SQL's COALESCE Function in Access SQL?

Migrating from T-SQL's COALESCE to Microsoft Access SQL

Transact-SQL (T-SQL) utilizes the COALESCE function to return a non-null value when encountering a NULL value. This proves invaluable when handling incomplete datasets, guaranteeing consistent output. However, Microsoft Access SQL lacks direct COALESCE support.

The equivalent functionality in Access SQL is achieved using the IIf() function. IIf() evaluates a condition and returns a specified value based on whether the condition is true or false. This allows for checking NULL values and providing an alternative:

<code class="language-sql">"Price: IIf(IsNull([Price]), 0, [Price])"</code>

This example checks if the Price field is NULL. If true, it substitutes 0; otherwise, it retains the original Price value.

This method effectively replicates the COALESCE function's behavior within Access SQL, maintaining data integrity and consistent results when dealing with potentially NULL data.

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