| name |
Keyword |
| Single-table queries |
Query a single column, all the columns, and eliminate duplicate columns named query results |
| Size comparison |
Value is equal to, less than or greater than a certain value and to determine the specific range |
| And determine whether a set of null values |
in、not in、null及not null |
| Character matches |
like %/_ |
| Sort Results / group statistics |
order by / group by, the group suggested having keywords |
| Aggregate Functions |
count, sum, avg, max and min |
| Collection query |
union、intersect、except |
| Join query |
join、left join、right join、full join |