ApsaraDB for OceanBase:Overview

Syntax

Syntax of constraint:

{ inline_constraint
| out_of_line_constraint
| inline_ref_constraint
| out_of_line_ref_constraint
}

inline_ref_constraint:
{ SCOPE  IS [ schema_name. ] scope_table
| WITH ROWID
| [ CONSTRAINT constraint_name ]
  references_clause
  [ constraint_state ]
}

out_of_line_ref_constraint:
{ SCOPE FOR ({ ref_col | ref_attr })lob_storage_clause
    IS [ schema_name. ] scope_table
| REF ({ ref_col | ref_attr }) WITH ROWID
| [ CONSTRAINT constraint_name ] FOREIGN KEY
    ( { ref_col [, ref_col ] | ref_attr [, ref_attr ] } ) references_clause
    [ constraint_state ]
}

Supported operations

• Defining inline constraints by using the inline_constraint clause is supported. For more information, see Inline constraints.

• Defining out-of-line constraints by using the `out_of_line_constraint` clause is supported. For more information, see Out-of-line constraints.

Unsupported operations

• Defining inline REF constraints by using the inline_ref_constraint option is not supported. This option will be ignored.

• Defining out-of-line REF constraints by using the out_of_line_ref_constraint clause is not supported. This option will be ignored.