340/340，通过初赛所有测试
- 1 basic
- 2 select-meta
- 3 date
- 4 drop table
- 5 update
- 6 typecast
- 7 show-index
- 8 like
- 9 select-tables
- 10 join-tables
- 11 aggregation-func
- 12 insert
- 13 update-select
- 14 unique
- 15 multi-index
- 16 null
- 17 simple-sub-query
- 18 function
- 19 text
- 20 expression
- 21 complex-sub-query
- 22 order-by
- 23 group-by
- 24 clog
- 25 alias
