Format an Update with calculation

út 18. 12. 2018 v 8:15 odesílatel Bret Stern <
bret_stern@machinemanagement.com> napsal:

My statement below updates the pricing no problem, but I want it to be
formatted with 2 dec points eg (43.23).

Started playing with to_numeric but can't figure it out. Lots of examples
with to_char in the
manual, but still searching for answer.

Can it be done?

postgres=# select random();
┌───────────────────┐
│ random │
╞═══════════════════╡
│ 0.261391982901841 │
└───────────────────┘
(1 row)

postgres=# select random()::numeric(7,2);
┌────────┐
│ random │
╞════════╡
│ 0.67 │
└────────┘
(1 row)

Regards

Pavel

"Bret" == Bret Stern <bret_stern@machinemanagement.com> writes:

Bret> My statement below updates the pricing no problem, but I want it
Bret> to be formatted with 2 dec points eg (43.23).

UPDATE ...
SET suggested_retail_price = round(suggested_retail_price*1.13, 2)
WHERE ...

assuming suggested_retail_price is already of type "numeric".

You could also have given the columm a type of numeric(18,2) or similar,
which would round all assigned values to 2 places.

--
Andrew (irc:RhodiumToad)

On 12/17/18 11:14 PM, Bret Stern wrote:

My statement below updates the pricing no problem, but I want it to be
formatted with 2 dec points eg (43.23).

Started playing with to_numeric but can't figure it out. Lots of
examples with to_char in the
manual, but still searching for answer.

Can it be done?

I want suggested_retail_price to be formatted to 2 decimal points

UPDATE im_ci_item_transfer
   SET suggested_retail_price=(suggested_retail_price +
(suggested_retail_price * .13))
WHERE item_code='0025881P2';

Feeling lazy, sorry guys

In addition to what Pavel posted:

select round(43.2335, 2);

round
-------
43.23

--
Adrian Klaver
adrian.klaver@aklaver.com

Thanks again,
I don't remember ever using a select in an update.
Not sure how to use a select in an update, I'll google around.

Bret,

That's just an example of how to use Postgres' cast syntax.  You'd write:
UPDATE im_ci_item_transfer
   SET suggested_retail_price=(suggested_retail_price +
(suggested_retail_price * .13))::numeric(7,2)
WHERE item_code='0025881P2';

I prefer the round() function, though.

On 12/18/2018 09:51 AM, Bret Stern wrote:

Thanks again,
I don't remember ever using a select in an update.
Not sure how to use a select in an update, I'll google around.

On Tue, 2018-12-18 at 08:18 +0100, Pavel Stehule wrote:

út 18. 12. 2018 v 8:15 odesílatel Bret Stern
<bret_stern@machinemanagement.com> napsal:

My statement below updates the pricing no problem, but I want
it to be
formatted with 2 dec points eg (43.23).

Started playing with to_numeric but can't figure it out. Lots
of examples with to_char in the
manual, but still searching for answer.

Can it be done?

postgres=# select random();
┌───────────────────┐
│ random │
╞═══════════════════╡
│ 0.261391982901841 │
└───────────────────┘
(1 row)

postgres=# select random()::numeric(7,2);
┌────────┐
│ random │
╞════════╡
│ 0.67 │
└────────┘
(1 row)

Regards

Pavel

I want suggested_retail_price to be formatted to 2 decimal
points

UPDATE im_ci_item_transfer
SET suggested_retail_price=(suggested_retail_price +
(suggested_retail_price * .13))
WHERE item_code='0025881P2';

Feeling lazy, sorry guys

--
Angular momentum makes the world go 'round.

On 18-12-2018 15:51, Adrian Klaver wrote:

On 12/17/18 11:14 PM, Bret Stern wrote:

My statement below updates the pricing no problem, but I want it to be
formatted with 2 dec points eg (43.23).

Started playing with to_numeric but can't figure it out. Lots of
examples with to_char in the
manual, but still searching for answer.

Can it be done?

I want suggested_retail_price to be formatted to 2 decimal points

UPDATE im_ci_item_transfer
   SET suggested_retail_price=(suggested_retail_price +
(suggested_retail_price * .13))
WHERE item_code='0025881P2';

Feeling lazy, sorry guys

In addition to what Pavel posted:

select round(43.2335, 2);

round
-------
43.23

Beware with round and numeric

select round(43.2375, 2);
round
-------
43.24

select 43.2375::numeric(17, 2);
numeric
---------
43.24

Regards,
HS

On 12/19/2018 02:12 AM, Condor wrote:

On 18-12-2018 15:51, Adrian Klaver wrote:

[snip]

In addition to what Pavel posted:

select round(43.2335, 2);

 round
-------
 43.23

Beware with round and numeric

select round(43.2375, 2);
 round
-------
 43.24

 select 43.2375::numeric(17, 2);
 numeric
---------
   43.24

Beware of what?

--
Angular momentum makes the world go 'round.

On Tue, Dec 18, 2018 at 5:51 AM Adrian Klaver <adrian.klaver@aklaver.com>
wrote:

On 12/17/18 11:14 PM, Bret Stern wrote:

My statement below updates the pricing no problem, but I want it to be
formatted with 2 dec points eg (43.23).

Started playing with to_numeric but can't figure it out. Lots of
examples with to_char in the
manual, but still searching for answer.

Can it be done?

I want suggested_retail_price to be formatted to 2 decimal points

UPDATE im_ci_item_transfer
SET suggested_retail_price=(suggested_retail_price +
(suggested_retail_price * .13))
WHERE item_code='0025881P2';

Feeling lazy, sorry guys

In addition to what Pavel posted:

select round(43.2335, 2);

round
-------
43.23

I think this discussion is missing an important point, which is the
difference between how a value is stored (i.e., what ends up as
suggested_retail_price in your table), and how it is formatted when you
select or use it. Whatever value you select in this update is going to get
converted to the column's datatype anyway. You haven't told us what the
datatype for s_r_p is, but consider this example:

CREATE TEMP TABLE price (
my_dec_2 DECIMAL(8,2),
my_numeric NUMERIC,
my_numeric_2 NUMERIC (8,2),
my_money MONEY
);
WITH num as (SELECT 4.2375914 AS base)
INSERT INTO price
SELECT base,base,base,base FROM num;

SELECT * FROM price;

my_dec_2 | my_numeric | my_numeric_2 | my_money
----------+------------+--------------+----------
4.24 | 4.2375914 | 4.24 | $4.24

So if you want your prices to be limited to 2 decimal places, just define
the columns as such. All the formatting mentioned in this thread is only
needed for outputting, selecting on the fly, etc.

Cheers,
Ken

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