1，select * 用於選擇表中的所有列
2,單獨查詢某些列，用逗號隔開即可
-----and,or ,>,< >=,<= ,=,<>不等於,in,not in,between and,not匹配相反,not null非空
----like 搭配萬用字元_：乙個字元，%：乙個或多個字元
----example:
select * from students where gender = '女'
and name = '小梅';
select * from students where birthday > '1993-04-05';
select * from students where id in (1,3);
select * from students where id = 1
or name = '小紅';
select * from students where name like
'小%';
select * from students where id <> 2;
select * from students where name like
'_東%';
----加(+)、減(-)、乘(*)、除(/)、求于(也叫模運算%)等等
注：如果插入資料有單引號，必須用單引號』或反斜槓\轉義
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