Case when應用

// 如果column_4 = 'IT_PROG' 那麼輸出 1.10 * column_3

// 如果column_4 = 'ST_CLERK' 那麼輸出 1.15 * column_4

// 否則輸出 column_3 使用別名 "REVISED_SALARY"

SELECT column_1,column_2,column_3 CASE column_4 WHEN 'IT_PROG' THEN 1.10*column_3
WHEN 'ST_CLERK' THEN 1.15*column_3
WHEN 'SA_REP' THEN 1.20*column_3
ELSE column_3 END "REVISED_SALARY"
FROM table_name;

//

SELECT column_1,column_2, SUM(CASE WHEN column_3 = '100' THEN column_4 ELSE 0 END) AS cost_100
FROM table_name
GROUP BY column_1,column_2;

// 如果 f_this_price = 0 或 f_last_price = 0 則結果為 0 ，如果都不為 0 時，取兩列差的合計

SELECT f_wzbm,
CASE WHEN SUM(f_this_price) = 0 OR SUM(f_last_price) = 0
THEN 0
ELSE SUM(f_this_price - f_last_price)
END f_markup_price
FROM table_nameGROUP BY f_wzbm;

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PL/SQL Case when應用

Case when應用

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