將查詢結果合二為一

Question

我試圖將 4 個計算返回到一個表中，這將是結果

這是截至目前的查詢：

/* new account */

SELECT count(*) as "new account"
FROM teams_trial teams
WHERE teams.user_id not in (select user_id from user_space_snapshot) and DATEADD(DAY, -30, GETDATE()) < teams.created_day

/* under limit */

SELECT count(*) as "under limit"
FROM user_space_snapshot u INNER JOIN trial_teams t ON (t.user_id = u.user_id)
WHERE DATEADD(DAY, -30, GETDATE()) < t.created_day AND u.space_used/u.space_limit < 0.9 

/* Near Limit */

SELECT COUNT(*) AS "near limit"
FROM user_space_snapshot u INNER JOIN trial_teams t ON (t.user_id = u.user_id)
WHERE DATEADD(DAY, -30, GETDATE()) < t.created_day AND u.space_used/u.space_limit between 0.9 and 1

/* Over Limit */

SELECT count(*) AS "over limit"
FROM user_space_snapshot u INNER JOIN trial_teams t ON (t.user_id = u.user_id)
WHERE DATEADD(DAY, -30, GETDATE()) < t.created_day AND u.space_used/u.space_limit > 1

理想情況下，結果如下所示：

usage_bucket | num_active_trials
---------------------------------
new account  | 5043
under limit  | 4560
near limit   | 1200
over limit   | 6452

Answer 1

最簡單的方法是使用union all ：

SELECT "new account" as usage_bucket, count(*) as num_active_trials
FROM teams_trial teams
WHERE teams.user_id not in (select user_id from user_space_snapshot) and DATEADD(DAY, -30, GETDATE()) < teams.created_day

union all

SELECT "under limit" as usage_bucket, count(*) as num_active_trials
FROM user_space_snapshot u INNER JOIN trial_teams t ON (t.user_id = u.user_id)
WHERE DATEADD(DAY, -30, GETDATE()) < t.created_day AND u.space_used/u.space_limit < 0.9 

union all

SELECT "near limit" as usage_bucket, count(*) as num_active_trials
FROM user_space_snapshot u INNER JOIN trial_teams t ON (t.user_id = u.user_id)
WHERE DATEADD(DAY, -30, GETDATE()) < t.created_day AND u.space_used/u.space_limit between 0.9 and 1

union all

SELECT  "over limit" as usage_bucket, count(*) as num_active_trials
FROM user_space_snapshot u INNER JOIN trial_teams t ON (t.user_id = u.user_id)
WHERE DATEADD(DAY, -30, GETDATE()) < t.created_day AND u.space_used/u.space_limit > 1

Answer 2

我知道這不是所要求的，但我想指出，由於 3 個查詢非常相似，您可以使用 CASE 語句將它們合並為一個

SELECT SUM(CASE WHEN u.space_used/u.space_limit < 0.9 THEN 1 ELSE 0 END) as "under limit",
       SUM(CASE WHEN u.space_used/u.space_limit BETWEEN 0.9 AND 1.0 THEN 1 ELSE 0 END) as "near limit",
       SUM(CASE WHEN u.space_used/u.space_limit > 1 THEN 1 ELSE 0 END) as "over limit"
FROM user_space_snapshot u
INNER JOIN trial_teams t ON (t.user_id = u.user_id)
WHERE DATEADD(DAY, -30, GETDATE()) < t.created_day