DROP SHARDING TABLE REFERENCE RULE 语法用删除指定的关联规则
DropShardingTableReferenceRule ::=
'DROP' 'SHARDING' 'TABLE' 'REFERENCE' 'RULE' ifExists? shardingReferenceRuleName (',' shardingReferenceRuleName)*
ifExists ::=
'IF' 'EXISTS'
shardingReferenceRuleName ::=
identifier
ifExists 子句用于避免 Sharding reference rule not exists 错误。DROP SHARDING TABLE REFERENCE RULE ref_0;
DROP SHARDING TABLE REFERENCE RULE ref_0, ref_1;
ifExists 子句删除关联规则DROP SHARDING TABLE REFERENCE RULE IF EXISTS ref_0;
DROP、SHARDING、TABLE、REFERENCE、RULE