Leetcode Problem 1440. Evaluate Boolean Expression

1440. Evaluate Boolean Expression

Leetcode Solutions

Joining Tables and Conditional Evaluation

Join the Expressions table with the Variables table on left_operand to get the value of the left operand.
Join the Expressions table with the Variables table on right_operand to get the value of the right operand.
Use a CASE statement to evaluate the boolean expression:
- If the operator is '<', check if the left operand's value is less than the right operand's value.
- If the operator is '>', check if the left operand's value is greater than the right operand's value.
- If the operator is '=', check if the left operand's value is equal to the right operand's value.
Return the original columns of the Expressions table along with the evaluated value as a new column.

erDiagram
    Variables {
        string name PK
        int value
    }
    Expressions {
        string left_operand PK
        enum operator PK
        string right_operand PK
    }

Using IF Statements for Conditional Evaluation

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Leetcode Problem 1440. Evaluate Boolean Expression

Leetcode Solutions

Joining Tables and Conditional Evaluation

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Query Steps

Code Implementation

Using IF Statements for Conditional Evaluation

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