sum

English [s?m] US [s?m]

n. ??, ??

vt.& ??, ??;

SQLite SUM ?? ???

??: SQLite SUM ?? ??? ???? ?? ?? ??? ??? ? ????.

??: ??sqlite> SELECT sum(?? ??? ?) FROM TABLENAME;

SQLite SUM ?? ?

COMPANY表

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
1           Paul        32          California  20000.0
2           Allen       25          Texas       15000.0
3           Teddy       23          Norway      20000.0
4           Mark        25          Rich-Mond   65000.0
5           David       27          Texas       85000.0
6           Kim         22          South-Hall  45000.0
7           James       24          Houston     10000.0

實(shí)例：

sqlite> SELECT sum(salary) FROM COMPANY;

結(jié)果：

sum(salary)
-----------
260000.0