SQL從1遞增特定列到N

Question

嗨我有一個名爲UID的列，該列的當前數據是像下面

uid 
--- 
0 
0 
0 
0 
0 
0 
0 
0 
0 

我想從1填補值N.因此，例如，下面

uid 
--- 
1 
2 
3 
4 
5 
6 
7 
8 
9 
. 
. 
n 

如何循環遍歷所有行和增量值。

Answer 1

如果是PRIMARY KEY和INT！則只能將列定義爲AUTO_INCREMENT。 既然你想要的UID被設置爲AUTO_INCREMENT，爲什麼不把它作爲PRIMARY KEY

CREATE TABLE TableName 
(
    UID INT AUTO_INCREMENT PRIMARY KEY, 
    -- other columns... 
) 

Answer 2

$n = 50; //number of your records suppose it was 50 
for($i=1; $i<=$n; $i++) 
{ 
    $res = mysql_query("select * from `table name` where `UID`=0 LIMIT 1 "); 
    if($row = mysql_fetch_assoc($res)) 
    { 

     mysql_query("update `table name` set `UID`='$i' where UID=0 limit 1 ") or die(mysql_error) 

    } 
} 

Answer 3

可以以簡單的方式這樣做只是爲了顯示順序排如下：

SET @rank=0; 
select @rank:=@rank+1 AS rank from Table1; 

否則，這樣做與PHP

編輯

嘗試做一些像日是：

ALTER TABLE Table1 MODIFY COLUMN `id` int(4) Primary key NOT NULL AUTO_INCREMENT;