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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.
Other syntax segmentsThese topics describe syntax segments, which are language elements, such as database object names or optimizer directives, that appear as a subdiagram reference in the syntax diagrams of some SQL or SPL statements.
Collection-Derived Table A collection-derived table is a virtual table in which the values in the rows of the table are equivalent to elements of a collection. Use this segment where you see a reference to Collection-Derived Table in a syntax diagram. This syntax is an extension to the ANSI/ISO standard for SQL.
Restrictions with the Collection-Expression Format
Additional Restrictions That Apply to ESQL/C

Additional Restrictions That Apply to ESQL/C

In addition to the previously described restrictions, the following restrictions also apply when you use the collection-expression format with :

You cannot specify an untyped COLLECTION as the host-variable data type.
You cannot use the format TABLE(?).
The data type of the underlying collection variable must be determined statically. To counter this restriction, you can explicitly cast the variable to a typed collection data type (SET, MULTISET, or LIST) that the database server recognizes. For example,
```
TABLE(CAST(? AS type))
```
You cannot use the format TABLE(:hostvar).
To counter this restriction, you must explicitly cast the variable to a typed collection data type (SET, MULTISET, or LIST) that the database server recognizes. For example,
```
TABLE(CAST(:hostvar AS type))
```

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