如何在select的结果中选择列的总和？

Question

如何在select的结果中选择列的总和？

Answer 1

SELECT 
    SUM(your_column) AS Total
FROM
    your_table;

......或者这是一个技巧问题吗？:)

Answer 2

这是一个MySQL聚合的内置函数列表

AVG() Return the average value of the argument
BIT_AND() Return bitwise and
BIT_OR()  Return bitwise or
BIT_XOR()(v4.1.1) Return bitwise xor
COUNT(DISTINCT)   Return the count of a number of different values
COUNT()   Return a count of the number of rows returned
GROUP_CONCAT()(v4.1)  Return a concatenated string
MAX() Return the maximum value
MIN() Return the minimum value
STD() Return the population standard deviation
STDDEV_POP()(v5.0.3)  Return the population standard deviation
STDDEV_SAMP()(v5.0.3) Return the sample standard deviation
STDDEV()  Return the population standard deviation
SUM() Return the sum
VAR_POP()(v5.0.3) Return the population standard variance
VAR_SAMP()(v5.0.3)    Return the sample variance
VARIANCE()(v4.1)  Return the population standard variance

我相信你想要的 SUM()