SQL is a standard computer language used to control the access to databases and manage data in databases.
SQL provides different statements to enable you to:
SQL consists of commands and functions that are used to manage databases and database objects. SQL can also forcibly implement the rules for data types, expressions, and texts. Therefore, SQL Reference describes data types, expressions, functions, and operators in addition to SQL syntax.
Released SQL standards are as follows:
DWS is compatible with Postgres-XC and supports the major features of SQL2, SQL3, and SQL4 by default.