Here are a few title options, playing with different levels of formality and emphasis: Formal: * Case Expression vs. Case Statement in MySQL: How Do They Differ? * Understanding the Distinctions Bet

Case Expression vs. Case Statement: Understanding the Differences

In MySQL, Case Expression and Case Statement provide conditional logic for different scenarios. Let's explore their differences:

Evaluation and Usage:

• Case Expression: Evaluates to a single value based on a series of conditions. Typically used within expressions or as an argument in other functions.
• Case Statement: Executes one of several statement blocks based on a given condition. Cannot be used as part of an expression.

Syntax:

Both constructs have similar syntax but with slight variations:

Case Expression:

CASE
WHEN [condition] THEN result
[WHEN [condition] THEN result ...]
[ELSE result]
END

Case Statement:

CASE
WHEN search_condition THEN statement_list
[WHEN search_condition THEN statement_list] ...
[ELSE statement_list]
END CASE

Usage in Stored Programs:

Case Statement is primarily intended for use within stored programs, where control flow and statement execution are required. However, Case Expression can also be used within stored programs if it is necessary to evaluate a condition and return a value.

Conclusion:

While both Case Expression and Case Statement perform conditional logic operations, their primary differences lie in their evaluation and usage characteristics. Case Expression is used for value evaluation, whereas Case Statement is used for statement execution. The syntax variations and usage restrictions in stored programs should be considered when selecting the appropriate construct.

The above is the detailed content of Here are a few title options, playing with different levels of formality and emphasis: Formal: * Case Expression vs. Case Statement in MySQL: How Do They Differ? * Understanding the Distinctions Bet. For more information, please follow other related articles on the PHP Chinese website!