Grouping:
Implemented row_number () over ()
语法：ROW_NUMBER() OVER(PARTITION BY COLUMN ORDER BY COLUMN)
Implemented group by
Syntax: group by Field [ase or desc]
Fuzzy query:
Implemented patindex
Returns the expression of a specified start position of the first occurrence; and if the pattern is not found in all valid text and character data types, a zero is returned.
Syntax: patindex ( '% pattern%', expression)
parameter
pattern
A string. You can use wildcards, but there must be pattern before and after (except the first and last character of the search)% character. pattern is an expression of short character data type category.
expression
expression, typically a column in which to search for the specified pattern, expression is a string data type category.
Return type
int
Note
PATINDEX useful for text data type; inter IS NULL, IS NOT NULL and the LIKE (these are the Where clause of type text only other valid comparison operation) outside, can also be used PATINDEX Where clause .
Implemented like
语法：select * from table1 where name like '%明%'
Sort by:
asc ascending
desc Descending
is sorted order by a field, gorup by a field is set in the same group