增量＆＃34;序列＆＃34;列基于另一列的字母顺序

Question

假设以下架构：

text|sequence
----|--------
Foo |       1
Bar |       2
Baz |       3

我如何UPDATE sequence列，从1开始递增，根据text列的字母顺序没有间隙？

结果数据如下所示：

text|sequence
----|--------
Foo |       3
Bar |       1
Baz |       2

Answer 1

试试这个：

UPDATE A 
SET A.sequene = B.sequence 
FROM tableA A 
INNER JOIN (SELECT text, ROW_NUMBER() OVER (ORDER BY text) sequence 
            FROM tableA 
           ) AS B ON A.text = B.text

Answer 2

试试这个

UPDATE A
SET A.Sequence = A.newSequence
FROM (SELECT Text, Sequence, ROW_NUMBER() OVER (ORDER BY sequence) newSequence
            FROM TABLEA) A