The DROP SHARDING TABLE REFERENCE RULE
syntax is used to drop specified sharding table reference rule.
DropShardingTableReferenceRule ::=
'DROP' 'SHARDING' 'TABLE' 'REFERENCE' 'RULE' ruleName (',' ruleName)*
ruleName ::=
identifier
DROP SHARDING TABLE REFERENCE RULE ref_0;
DROP SHARDING TABLE REFERENCE RULE ref_0, ref_1;
DROP
, SHARDING
, TABLE
, REFERENCE
, RULE