github.com/cockroachdb/cockroach@v20.2.0-alpha.1+incompatible/docs/generated/sql/bnf/add_constraint.bnf (about)

     1  alter_onetable_stmt ::=
     2  	'ALTER' 'TABLE' table_name 'ADD' 'CONSTRAINT' constraint_name constraint_elem opt_validate_behavior
     3  	| 'ALTER' 'TABLE' 'IF' 'EXISTS' table_name 'ADD' 'CONSTRAINT' constraint_name constraint_elem opt_validate_behavior