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# How do I put days of the week in order...Monday, Tuesday, Wednesday, etc?

How do I put days of the week in order...Monday, Tuesday, Wednesday, etc.?

If you want to order by the day of the week, then just order by column which contains the date. For testing purposes, I've set up a little test table which contains only one column (DAY). Below is a query which shows the contents of that column:

```   SQL> select day,to_char(day,'DAY') from test;

DAY       TO_CHAR(D
--------- ---------
01-MAY-01 TUESDAY
02-MAY-01 WEDNESDAY
03-MAY-01 THURSDAY
04-MAY-01 FRIDAY
05-MAY-01 SATURDAY
06-MAY-01 SUNDAY
07-MAY-01 MONDAY
08-MAY-01 TUESDAY
09-MAY-01 WEDNESDAY
10-MAY-01 THURSDAY```

Now, they were inserted into this table in sorted order. So let's see how to put them in *reverse* order!

```   SQL> select day,to_char(day,'DAY') from test
2  order by day desc;

DAY       TO_CHAR(D
--------- ---------
10-MAY-01 THURSDAY
09-MAY-01 WEDNESDAY
08-MAY-01 TUESDAY
07-MAY-01 MONDAY
06-MAY-01 SUNDAY
05-MAY-01 SATURDAY
04-MAY-01 FRIDAY
03-MAY-01 THURSDAY
02-MAY-01 WEDNESDAY
01-MAY-01 TUESDAY```

Notice that the days of the week go into reverse order now! I've just used the ORDER BY clause on the column of DATE datatype.

If you want to group all of the "Tuesdays" together, then you'll have to order by the TO_CHAR column as can be seen in the following example:

```   SQL> select day,to_char(day,'DAY') from test
2  order by 2;

DAY       TO_CHAR(D
--------- ---------
04-MAY-01 FRIDAY
07-MAY-01 MONDAY
05-MAY-01 SATURDAY
06-MAY-01 SUNDAY
03-MAY-01 THURSDAY
10-MAY-01 THURSDAY
01-MAY-01 TUESDAY
08-MAY-01 TUESDAY
02-MAY-01 WEDNESDAY
09-MAY-01 WEDNESDAY```

Notice that all of the Wednesday's are together, etc. But if you want this sorted further so that all of the Monday's fall before the Tuesday's, then you'll need one more trick. You'll have to use the TO_CHAR function again, but this time, get the day of the week as a number. For instance, see below:

```   SQL> select day,to_char(day,'DAY'),to_char(day,'D') from test
2  order by to_char(day,'D');

DAY       TO_CHAR(D T
--------- --------- -
06-MAY-01 SUNDAY    1
07-MAY-01 MONDAY    2
01-MAY-01 TUESDAY   3
08-MAY-01 TUESDAY   3
02-MAY-01 WEDNESDAY 4
09-MAY-01 WEDNESDAY 4
03-MAY-01 THURSDAY  5
10-MAY-01 THURSDAY  5
04-MAY-01 FRIDAY    6
05-MAY-01 SATURDAY  7```

Notice now that all of the Tuesday's fall before the Wednesday's, etc.

I wasn't sure which way you wanted to sort your data so that is why I gave you three examples. Hopefully, one of these fit the bill!!

This was last published in May 2001

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