How Can I Replace COALESCE in Access SQL?

Replacing COALESCE in Microsoft Access SQL

SQL Server's COALESCE function elegantly handles NULL values by replacing them with a specified value. Microsoft Access SQL lacks a direct COALESCE equivalent, but the IIf function provides the same functionality.

The IIf function evaluates a condition and returns one value if true, another if false. Its syntax is:

<code class="language-sql">IIf(condition, true_value, false_value)</code>

To mimic COALESCE, we use IIf to check for NULLs:

<code class="language-sql">IIf([Field] Is Null, replacement_value, [Field])</code>

This replaces any NULL value in [Field] with replacement_value. For example, to replace NULL prices with 0:

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

This Access SQL statement achieves the same result as a COALESCE function in SQL Server, effectively managing NULL values within Access queries.

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