Use oracle rownum to make the table sort Field Values continuous, using lerownum

Source: Internet
Author: User
Tags oracle rownum

Use oracle rownum to make the table sort Field Values continuous, using lerownum

Use oracle rownum to make the table sort Field Values continuous

1. Requirements

The fields in the table (eval_index) are as follows:

Table Field

Description

Description

ID

Primary Key

 

GROUP_ID

Group ID

 

SORT_NUM

Sequence Number

Number and sort by score: 1, 2 ,...

Due to deletion or other operations, the sequence number of sort_num is not consecutive. You do not need to change the original sequence to keep its serial number continuous.

2. Use rownum to implement

Update eval_index a seta. sort_num = (

Select B. rn from (select rownum rn, id

From (select * from eval_index wheregroup_id =?

Order by sort_num)

) B

Where a. id = B. id

)

Where index_id = ?;

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