Re: Can an SQL common table expression be used for many different selects?

Are you LIMITing the cursor to 50 rows?

If you're using LIMIT/OFFEST or FETCH FIRST in the cursor, that would make
sense.

Charles

On Tue, Jul 28, 2020 at 9:40 AM Maria Lucia Stoppa <mlstoppa@xxxxxxxxx>
wrote:

@Charles
I did it, but it doesn't work.
[image: image.png]
wTotalRows equals to 50 which is wRowsToRead instead of 994, as it should
be.

Il giorno mar 28 lug 2020 alle ore 16:21 Charles Wilt <
charles.wilt@xxxxxxxxx> ha scritto:

Again, use the GET DIAGNOSTICS after the OPEN, not the FETCH.

The grouping stuff is in 7.2, some of the OLAP functions are, but

there's

been a bunch added.

Charles

On Tue, Jul 28, 2020 at 8:11 AM Maria Lucia Stoppa <mlstoppa@xxxxxxxxx

wrote:

@Charles
I've just tried and it returns the number of fetched rows only, not

the

total result set length.

I'll take a look at those new features you suggested, hoping they

exist

at

V7R2 also.


Il giorno mar 28 lug 2020 alle ore 15:58 Charles Wilt <
charles.wilt@xxxxxxxxx> ha scritto:

On Tue, Jul 28, 2020 at 3:17 AM Maria Lucia Stoppa <

mlstoppa@xxxxxxxxx

wrote:

Everything works fine, except the same static SQL statement is

run

at

least

twice to know the total number of rows (a simple count(*)) and

the

rows

themselves page by page.

GET DIAGNOSTIC DB2_NUMBER_ROWS is what you want to look at here.

If the previous SQL statement was an OPEN or a FETCH which caused

the

size of the result table to be known, returns the number of rows in

the

result
table. For SENSITIVE cursors, this value can be thought of as an
approximation since rows inserted and deleted will affect the next
retrieval of
this value. Otherwise, the value zero is returned.


Run it after you OPEN your cursor, before you FETCH.

Now, on the same data retrieved by this SQL statement, others

select

statements must be run to get some totals according to different

group

by

clauses in order to present the data set distribution to the

final

user.

Have you looked at the OLAP functions in addition to ROLLUP, CUBE

and

grouping sets?

https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_74/db2/rbafzolapexp.htm

https://www.ibm.com/support/knowledgecenter/ssw_ibm_i_74/db2/rbafzgroupbyclause.htm

When I started writing SQL on the AS/400, (sub)totaling required an

extra

statement.
That is no longer the case.

Charles
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