MySQL處理null的兩個函數

 COALESCE()函數 數據庫 示例：express SELECT COALESCE ( 2, 0 ), COALESCE ( '2', '0' ), COALESCE ( NULL, NULL, '3' ), COALESCE ( NULL, 0 )   簡化函數：  IFNULL(expression,value) 函數             轉載內容：code COALESC

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