Salesforce Salesforce Object Query Language (SOQL) Dynamic SOQL
Example
You can execute a database query from a String rather than a regular SOQL expression:
String tableName = 'Account';
String queryString = 'SELECT Id FROM ' + tableName + ' WHERE CreatedDate >= YESTERDAY';
List<SObject> objects = Database.query(queryString);
Since dynamic SOQL queries are not compiled, their schema references are not validated, so it is preferable to use Apex variable interpolation using the :variable syntax where possible.
