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SQL (Structured Query Language) is a language that is used to communicate with databases and to retrieve and manipulate data stored in them. As a beginner or data analyst, it’s important to have a good understanding of the various components of SQL, including the CASE statement.
The CASE statement is a type of conditional expression that can be used in SQL to control the flow of your queries. It allows you to perform conditional logic in your queries by evaluating a condition and then returning a result based on that evaluation.
The basic syntax of the CASE statement is as follows:
CASE WHEN condition_1 THEN result_1 WHEN condition_2 THEN result_2 ... ELSE result_n END
In the syntax above, “condition_1”, “condition_2”, and so on, represent the conditions that you want to evaluate. “Result_1”, “Result_2”, and so on, represent the results that will be returned if the conditions are met.
You can use the CASE statement in various ways, such as in a SELECT statement to return a result based on the value of a particular column. For example, if you have a table with a column that contains gender information, you can use the CASE statement to return a result that replaces the gender data with “Male” or “Female” based on the value of the column.
Another way to use the CASE statement is in an UPDATE statement to update data based on a certain condition. For example, you might have a column that contains salary information and you want to update the salary of all employees who earn less than a certain amount. In this case, you can use the CASE statement to update the salary of these employees to the desired amount.
In summary, the CASE statement is a powerful tool in SQL that allows you to perform conditional logic in your queries. As a beginner or data analyst, it’s important to have a good understanding of the CASE statement and how it can be used to control the flow of your queries and manipulate data stored in your databases.
SQL for Beginners and Data Analyst – Chapter 10: CASE
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