兩個地方在一個查詢中

Question

我需要根據不同的標準在同一個查詢中得到兩個求和。兩個標準都在同一列上運行。 有沒有辦法做到這一點？

我可以用一個例子來說明這一點：

表： salary_survey_result

列： 行業， 位置， 位置， 工資

有效地我想結合以下兩個查詢：

SELECT industry, location, count(*) as MORE_THAN_SIX_FIGURE 
FROM salary_survey_result 
WHERE salary > 100000 
GROUP BY industry, location 

和

SELECT industry, location, count(*) as MORE_THAN_FIVE_FIGURE 
FROM salary_survey_result 
WHERE salary > 10000 
GROUP BY industry, location 

所以結果是這樣的：
industry location MORE_THAN_FIVE_FIGURE MORE_THAN_SIX_FIGURE

---

Healthcare NY    45      10 
Healthcare MN    35      6 
InfoTech  NY    50      19 
InfoTech  MN    40      12 

Answer 1

喜歡的東西

SELECT industry, 
     location, 
     sum(case when salary >= 10000 then 1 else 0 end) as MORE_THAN_FIVE_FIGURE, 
     sum(case when salary >= 100000 then 1 else 0 end) as MORE_THAN_SIX_FIGURE 
    FROM salary_survey_result 
    WHERE salary >= 10000 
    GROUP BY industry, location 

WHERE salary >= 10000子句對結果沒有必要。如果SALARY上有一個索引，並且大多數工資值小於10000，它可能會提高績效。請注意，我還假設您的意思是>=而不是>，因爲10,000的工資是五位數工資。

Answer 2

SELECT industry, location, count(*) as MORE_THAN_FIVE_FIGURE ,sum(salary > 100000) as MORE_THAN_SIX_FIGURE 
FROM salary_survey_result 
WHERE salary > 10000 
GROUP BY industry, location