ddl:create,alter,show,drop
dml:insert,update,delete
from>on>join>where>group by>AGG_FUNC>WITH ROLLUP CUBE>HAVINg>SELECT>DISTINCT>ORDER BY>LIMIT
内连接,外连接,交叉连接,自然连接,自连接,子查询
create,grant,revoke,alter,drop
ddl:create,alter,show,drop
dml:insert,update,delete
from>on>join>where>group by>AGG_FUNC>WITH ROLLUP CUBE>HAVINg>SELECT>DISTINCT>ORDER BY>LIMIT
内连接,外连接,交叉连接,自然连接,自连接,子查询
create,grant,revoke,alter,drop
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