What does this soql query do?
Prerequisites. Some queries in this unit expect the org to have accounts and contacts.
What is selective soql queries?
A query is selective when one of the query filters is on an indexed field and the query filter reduces the resulting number of rows below a system-defined threshold. The performance of the SOQL query improves when two or more filters used in the WHERE clause meet the mentioned conditions.
What is return type of soql?
SOQL return types SOQL queries evaluate to the following return types: an sObject singleton- ‘Account acc = [SELECT Id FROM Account LIMIT 1]’ alist of sObjects – [SELECT Id FROM Account]’ an integer- ‘Integer i = [SELECT COUNT() FROM Account]’
What is SQL LIKE operator?
The SQL LIKE Operator. The LIKE operator is used in a WHERE clause to search for a specified pattern in a column. There are two wildcards often used in conjunction with the LIKE operator: % – The percent sign represents zero, one, or multiple characters. _ – The underscore represents a single character.
What is SQL like?
The SQL Server LIKE is a logical operator that determines if a character string matches a specified pattern. A pattern may include regular characters and wildcard characters. The LIKE operator is used in the WHERE clause of the SELECT, UPDATE, and DELETE statements to filter rows based on pattern matching.