How to sort values in columns and update table?

Question

I\'m completely new to sql and can\'t do that myself. So I need your help. I want to sort values in column and then save changes. But I don\'t know how to do that.

T

Answer 1

You can use alter table command which is simpler.

mysql> ALTER TABLE games ORDER BY name asc;

That's all !

Answer 2

You would have to use a second table

1. create a new table games2 with the same structure as your games table, making sure the ID is auto-incrementing

   CREATE TABLE `games2` LIKE `games`;
   

2. copy the data, sorted, into games2

   INSERT INTO `games2` (`Name`, `SomeDescription`) SELECT `Name`, `SomeDescription` FROM `games` ORDER BY `Name`
   

3. drop or move the old table

   -- DROP TABLE `games`;
   -- or
   RENAME TABLE `games` TO `games1`;
   

4. rename new table to old name

   RENAME TABLE `games2` TO `games`;
   

These steps will result in what you want.

Answer 3

you can sort on two fields at the same time.

SELECT *
FROM games
ORDER BY id DESC, name ASC

I don't understand what you mean by save changes in the table. The ORDER BY, is just changing the display that you are looking at it doesn't change the data in the table unless you perform an UPDATE.

If you are unfamiliar with SQL, there are a lot of tutorials online that can help:

SQL Course

Beginner SQL Tutorial

SQL Tutorial - Learn SQL

Edit based on the comments, this can be done in one step:

create table #temp
(
    id int,
    name varchar(50),
    somedesc varchar(50)
)

insert into #temp values (1, 'best', 'desc1')
insert into #temp values (2, 'worth', 'desc2')
insert into #temp values (3, 'good', 'desc3')

update t1
SET t1.id = t2.rn
    , t1.somedesc = t1.somedesc
FROM #temp t1
JOIN 
(
    select id, name, somedesc, row_number() over(order by name, id) as rn
    from #temp 
) t2
on t1.id = t2.id

select *
from #temp
order by id

drop table #temp

Answer 4

You can use the ROW_NUMBER ranking function to renumber the rows.

SELECT UnsortedId = id
, SortedId = ROW_NUMBER() OVER (ORDER BY g.name, g.id)
FROM games 

Answer 5

This is my fix... stupid simple:

1. Extract to temp table

SELECT SortKeyValue (add any other fixed values, just don't include the existing sequence) INTO #Temp FROM SourceTable;

2. Empty the table:

TRUNCATE TABLE SourceTable

3. Reinsert:

INSERT INTO SourceTable (SortKeyValue, DisplayOrder (plus other fields)) SELECT SortKeyValue, ROW_NUMBER() OVER (ORDER BY SortKeyValue) AS DispOrd (plus other fields) FROM #Temp;

4. Done!

Answer 6

it is simple. just use a few codes. I have tried this and it is working. first create a temporary table while sorting values at the same time.

    create table new as select * from games order by name;

and then drop the games table using,

    drop table games;

now create games table again with same properties and data as in new (where sorting here is an optional) using,

    create table games as select * from new order by name;

now drop the temp table 'new'

    drop table new;

now check your table. it must be sorted out.