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Introduction

Variables and constants store values you can later use anywhere in your query.

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Basic Usage

Variables are placeholders that can be assigned and reassigned values throughout the SQL code. To assign a value to a variable, use the equal sign = followed by the value. 
{name = 'foo'}
{age = 30}
{sum = 2 + 4}
For example, take a look at the following Latitude Query, and what will actually be compiled and executed in the database: 
/* Defining the variable and SQL code */

{sum = 2 + 4} 

SELECT *
FROM table
WHERE id = {sum}

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Incrementing

Variables can be modified using operations such as addition. 
{counter = 10} /* Define the variable */

SELECT *
FROM table
WHERE id != null
AND (
    {#each [1, 2, 3] as products, index}
        /* Print the value of the variable */
        id = {counter}

        /* Add an 'OR' at the end to every element except the last one */
        {#if index + 1 < products.length}
            OR
        {/if}

        /* Increment the value of the variable */             
        {counter = counter + 10}
    {/each}
)

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Constants

Constants are similar to variables but, once defined, their value cannot be changed. Also the main syntax difference is constants are defined using the @const keyword. 
{@const name = 'value'}
Your Query
{@const birthday = '2000/02/28'} /* Defined a constant */

SELECT *
FROM table
{#if birthday = '2000/02/28'}
    {birthday = '2024/12/31'} /* Reassigning the constant */
{/if}
Output
'!Error: Cannot reassign a constant'

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Scope

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Global

Variables defined outside of any logic blocks are considered global and can be modified and accessed throughout the entire code. 
{var1 = 'latitude'}
Variables can be accessed and modified anywhere in the code. 
{name = 'latitude'} /* Define the variable */

SELECT *
FROM table
WHERE name = {name}
{name = 'longitude'} /* Reassign the variable */
OR name = {name}

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Local Variables

Variables defined within logic blocks are local to that block. They cannot be accessed outside the block in which they are defined. 
{#if condition}
    {var2 = 'localValue'} /* Accessible only within this block */
{/if}