12. Evaluate Boolean Expression

Grokking SQL for Tech Interviews

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Problem

Table Variables:

+---------------+---------+
| Column Name   | Type    |
+---------------+---------+
| name          | varchar |
| value         | int     |
+---------------+---------+
In the `Variables` table, `name` is the primary key.
This table contains the stored variables and their values.

Table Expressions:

+---------------+---------+
| Column Name   | Type    |
+---------------+---------+
| left_operand  | varchar |
| operator      | enum    |
| right_operand | varchar |
+---------------+---------+
In the `Expressions

.....

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Table of Contents

Contents are not accessible