#Sqlite boolean expression code

We will use the tracks table for the demonstration. Similar to the simple CASE expression, the searched CASE expression stops the evaluation when a condition is met. If you omit the ELSE clause, the searched CASE expression returns NULL. In case no expression evaluates to true, the searched CASE expression returns the expression in the ELSE clause if specified. The searched CASE expression evaluates the Boolean expressions in the sequence specified and return the corresponding result if the expression evaluates to true. The following illustrates the syntax of the searched CASE expression.

Note that the simple CASE expression only compares for equality, while the searched CASE expression can use any forms of comparison. The searched CASE expression evaluates a list of expressions to decide the result.

#Sqlite boolean expression code

WHEN 'USA' THEN 'Domestic' ELSE 'Foreign' END CustomerGroupįirstName Code language: SQL (Structured Query Language) ( sql ) To make this report, you use the simple CASE expression in the SELECT statement as follows: SELECT customerid,

Suppose, you have to make a report of the customer groups with the logic that if a customer locates in the USA, this customer belongs to the domestic group, otherwise the customer belongs to the foreign group. Let’s take a look at the customers table in the sample database. In other words, it returns the result and stop evaluating other conditions as soon as it finds a match. The simple CASE expression uses short-circuit evaluation. If you omit the ELSE clause, the CASE expression returns NULL. In case no case_expression matches the when_expression, the CASE expression returns the result_else in the ELSE clause. Otherwise, the simple CASE expression compares the case_expression with the expression in the next WHEN clause. If the case_expression equals when_expression_1, the simple CASE returns the expression in the corresponding THEN clause, which is the result_1. The simple CASE expression compares the case_expression to the expression appears in the first WHEN clause, when_expression_1, for equality.

CASE case_expressionĮND Code language: SQL (Structured Query Language) ( sql ) The following illustrates the syntax of the simple CASE expression. The simple CASE expression compares an expression to a list of expressions to return the result. SQLite provides two forms of the CASE expression: simple CASE and searched CASE. For example, you can use the CASE expression in clauses such as WHERE, ORDER BY, HAVING, SELECT and statements such as SELECT, UPDATE, and DELETE. You can use the CASE expression in any clause or statement that accepts a valid expression. The CASE expression is similar to the IF-THEN-ELSE statement in other programming languages. The SQLite CASE expression evaluates a list of conditions and returns an expression based on the result of the evaluation. Summary: in this tutorial, you will learn about the SQLite CASE expression to add the conditional logic to a query.