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SQL語法  // Posts tagged as "SQL語法"

16 三月 DB資料庫 | Comments

善用 ORDER BY 位置順序編號

當 UNION ALL 匯集好幾個查詢語句,而偏偏要用來排序的欄位,在各查詢語句中的欄位名又不一致時,這時 ORDER BY 查詢結果中某一個欄位的位置順序編號,就很好用

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20 一月 DB資料庫 | Comments

字串的日期比對 vs BETWEEN AND 語法效率

查證後...用字串的日期比對,會比用 BETWEEN...AND 語法,來得有效率

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