Oracle 中 decode 函數用法（字段A，B, C，A不爲空則取A，不然取B，B爲空則取C）

–decode(條件,值1,返回值1,值2,返回值2,…值n,返回值n,缺省值) SELECT DECODE(TEMP.SCORE, ‘A’, ‘90-100’, ‘B’, ‘80-89’, ‘C’, ‘70-79’, ‘D’, ‘60-69’, ‘E’, ‘0-59’, ‘其餘’) AS XXX FROM (SELECT ‘A’ SCORE FROM DUAL) TEMP –結果：’90-100

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