如何統計SQL中聯合操作的記錄數量？

Question

我使用下面的SQL查詢

SELECT count(column1) from table1 where CONDITION1 
UNION 
SELECT count(column1) from table1 where CONDITION2; 

當我運行查詢它給出兩個數值結果。但是我需要一個單一的數字結果來計算上述操作記錄的數量。我不知道如何編寫該查詢。有誰能夠幫助我？

Answer 1

請嘗試：

SELECT count(column1) from table1 where CONDITION1 OR CONDITION2 

Answer 2

這取決於你是否意味着有兩次table1

SELECT 
    SUM(TheCount) 
FROM 
    (
    SELECT count(column1) AS TheCount from table1 where CONDITION1 
    UNION 
    SELECT count(column1) from table1 where CONDITION2 
    ) X; 

或

SELECT count(column1) AS TheCount 
    from table1 
    where (CONDITION1) OR (CONDITION2);