Home
SQL programmingYou can use the HCL OneDB™ implementation of the SQL language to develop applications for HCL OneDB™ database servers.
Guide to SQL: SyntaxThe HCL OneDB™ Guide to SQL: Syntax describes the syntax of the statements, data types, expressions, operators, and built-in functions of the HCL OneDB™ dialect of the SQL language.
SQL statementsThis chapter describes the syntax and semantics of SQL statements that are recognized by HCL OneDB™.
CREATE TABLE statementUse the CREATE TABLE statement to create a new permanent table in the current database.
Column definitionUse the column definition segment of the CREATE TABLE statement to declare the name and data type (and optionally the default value and the constraints or the security label) of a single column of the new table.
Single-Column Constraint FormatUse the Single-Column Constraint format to define and declare the name of at least one constraint on a single column, and to specify the mode of each constraint.
Constraint Definition
Declaring a Constraint Name
Constraint Names That the Database Server Generates

Constraint Names That the Database Server Generates

If you do not specify a constraint name, the database server generates a constraint name using the following template:

constraint_typetabid_constraintid

In this template, constraint_type is the letter u for unique or primary-key constraints, r for referential constraints, c for check constraints, and n for NOT NULL constraints. In the template, tabid and constraintid are values from the tabid and constrid columns of the systables and sysconstraints system catalog tables, respectively. For example, the constraint name for a unique constraint might look like ? u111_14? (with a leading blank space).

If the generated name conflicts with an existing identifier, the database server returns an error, and you must then supply an explicit constraint name.

The generated index name in sysindexes (or sysindices) has this format:

[blankspace]tabid__constraintid

For example, the index name might be something like " 111_14 " (quotation marks used here to show the blank space).