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coalesce

Returns the first non-null value in the argument list. Like a CASE expression, arguments are only evaluated if necessary. Examples:
examples.sql
CREATE TABLE tbl as VALUES ('1', null), ('2', '2'), (null, '3');
SELECT 
    COALESCE(column1, column2) as value
FROM tbl;
 -- value '('1', '2', '3')'
Supported Signatures 
function coalesce($1, ...) returns $1
🔗 Official Documentation

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if

Evaluates expression parameter and returns second if condition is true, otherwise null is returned and true_value is not evaluated. Examples:
examples.sql
SELECT IF(2 > 1, 'HIGHER', 'LOWER') AS value; -- value 'HIGHER'
Supported Signatures 
function if(boolean, $1, $1) returns $1
🔗 Official Documentation

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nullif

Returns null if value1 equals value2, otherwise returns value1. Examples:
examples.sql
SELECT nullif(1, 1) AS value; -- value 'NULL'
SELECT nullif(2, 1) AS value; -- value '2'
Supported Signatures 
function nullif($1, $1) returns $1
🔗 Official Documentation