1, the regular expression
2, field splicing Concat () function
3, text functions, to the case of interception of character spaces
4, the date and time handler
5, the average aggregate functions most aggregate function values are summed composition
6, packet filtering sorting
7, sub-query using a subquery as calculated fields
8, internal links
9, from the outer coupling links connected to the natural aggregate functions coupling
10, combination inquiry union union all