0
在一個大的數據庫,是它更快地執行查詢如查詢速度
select * from table where a = 1 and b = 2 or b = 3 or b = 4;
或
select * from table where a = 1 and b = 2;
select * from table where a = 1 and b = 3;
select * from table where a = 1 and b = 4;
我認爲它取決於如果'a'是關鍵或索引或不... –
只是一個挑剔的筆記,第一個查詢將返回比你想象的要多得多,因爲缺少括號變量b。 'select * from table where a = 1 and(b = 2 or b = 3 or b = 4)' – Tommy