SQL Reference Material Data Types – Specifies the kind of data that an SQL column can contain. Date and Time Constructs – Validates and converts an ODBC date, time, or timestamp. Default user name and password – Provides default login identity. SQLCODE Error Codes – SQL error codes. Field constraint – Specifies rules about a field’s contents. Reserved words – A list of SQL reserved words for InterSystems IRIS® data platform. Special Variables – System-supplied variables. String Manipulation – String manipulation functions and operators.