How to Convert Month Numbers to Month Names in SQL without CASE Statements?

Efficient SQL Tips: Convert month numbers to month names without CASE statement

In SQL Server, months are usually stored as numbers (1, 2, ..., 12), but for readability it is useful to display them as month names (January, February, etc.). While it is possible to use the CASE statement, here is a cleaner alternative:

Use the DateName() and DateAdd() functions skillfully

The following query utilizes the DateName() and DateAdd() functions:

<code class="language-sql">Select DateName(month, DateAdd(month, @MonthNumber, 0) - 1)</code>

Detailed explanation of the principle:

• DateAdd(month, @MonthNumber, 0) Subtracts one month from the specified month number (@MonthNumber) to align with the zero-based month index in the DateName() function.
• DateName(month) Extract the month name from the modified date.

Another effective method

Another feasible solution is:

<code class="language-sql">Select DateName(month, DateAdd(month, @MonthNumber, -1))</code>

Detailed explanation of the principle:

• DateAdd(month, @MonthNumber, -1) Subtracts one month from the specified month number (@MonthNumber) to align with the one-based month index in the DateName() function.
• DateName(month) Extract the month name from the modified date.

Both queries can effectively convert month numbers into corresponding month names while avoiding the use of CASE statements, making the code more concise and efficient.

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