SQL & PL/SQL :: Difference Between Count(1) And Count(*)
Nov 24, 2011
difference between count(1) and count(*). As i know count(*) will give number of rows irrespective of null and count(1) will not count the null.My Oracle version is 10 g.
SQL> select * from t1;
A B C
---------- -------------------- --------------------
1 2 3
2
5
SQL> select rownum,a.* from t1 a;
ROWNUM A B C
---------- ---------- -------------------- --------------------
1 1 2 3
2 2
3 5
4
[code]....
I am trying to get a record count of this table and i get 2 different output , select count(*) shows 68560 and after updating the stats the NUM_ROWS shows 68323, why the difference .
SQL> select count(*) from dcepcd;
COUNT(*) ---------- 68560
SQL> select num_rows from dba_tables where table_name='DCEPCD';
SELECT COUNT(*) FROM APP.Big_table; Number of record--222653402
This is a big table to get the it's taking 8 minutes time, so that I tried the following SQL to get the count quickly.
SELECT num_rows FROM all_tables WHERE table_NAME='BIG_TABLE'
and owner='APP'; --Number of records 237213998But I got the different count for the two SQLs. Why there is a difference in the count. Which one is correct.
Find the date difference. I need to find that how many days the task is pending, if ACT_NAME field switching from 'SET PENDING%' to 'RESUME PENDING%' by using ACTIONTAKENDATETEXT field in the History table.
Example as needed: NoPendingDays = 23 (8+15)
I have attached Create table and Insert table values sample as SQL file.
I'm using this code, and it performs fine, but I'm wondering if there is a more elegant way to do it--maybe with "ROLLBACK". Basically (as you can see) I need to get a normal count for each group but also for each group take a percentage of the total count (so all groups pct adds up to 100 (oh yeah, don't test for zero below, but just a test... )
select c.Event, c.code, count(1) as calls, total.total_count, count(1) / total.total_count * 100 as pct_of_total from table1 c
[Code]....
[Edit MC: add code tags, do it yourself next time]
Reg. Area Age <=19 20 <= Age <= 24 25 <=Age <= 29 Total No. of Voters xxxx 10 15 7 32 yyyy 5 7 3 15
I have work out a script but the age is not in a range
select * FROM (select rgs_id_reg_area, count(decode(fbd_age,19,fbd_age)) Age19, count(decode(fbd_age,20,fbd_age)) Age20 FROM rubyvoterstat where vote ='Y' GROUP by rgs_id_reg_area) order by rgs_id_reg_area
I am running this query but am not getting data that is correct.
SELECT a.prod_id, a.prod_name, a.artist_name, COUNT(*) FROM po_my_purchase_tb a, cm_track_tb b WHERE a.prod_id = b.prod_id and b.GNR_CD = 'GR000017' AND a.purchase_date > '10-FEB-10' AND ROWNUM<50 GROUP BY a.prod_id, a.prod_name, a.artist_name, a.buy_seq ORDER BY COUNT(*) desc
I need to get an accumulated value for a count. E.g. The table has purchased date, purchased item, purchased item type. The count of purchased item groyup by purchased type on every purchased date. Now, we got the count value (purchased item). But, I want the accumulated count value on every purchased date. So that I will get that how many items has been purchased on a particular date.
I pulled in 1121 SSN's into a table and am using that table as the basis for returning data from other tables...including how many documents a user has in their folder.
My query; however, is only returning 655 rows...it is returning only those rows that have documents in their folders. I want to return ALL rows...WHETHER OR NOT THEY HAVE A DOCUMENT COUNT (count(*)). How can I get all 1,121 rows to return? I would like the output to look like:
SSN LOCATION EMP_STATUS FOL_STATUS COUNT(*) -- For those folders containing documents: XXX-XX-XXXX WHATEVER WHATEVER WHATEVER 12
-- For those folders containing 0 documents: XXX-XX-XXXX WHATEVER WHATEVER WHATEVER NULL
Here is the query in it's current state:
-- Get User/Folder/Doc Count Information SELECT b.ssn, b.location, b.emp_status, c.fol_status, COUNT (*)
[Code]....
So again, my problem here is that...not all FOLDERS contain DOCUMENTS...but I still want the folder data lised...I just need it listed with either a zero count (0), or a NULL in the COUNT(*) column.
I'm trying the various joins, but none of them seem to be working.
I've tried the old 8i (+) join as follows:
AND c.fol_id = d.doc_fol_id(+)
I've tried the inner join:
AND c.fol_id(+) = d.doc_fol_id
...and I've tried the 9i method (left outer and full outer) using the following types of notations:
folder c full outer join documend d on c.fol_id = d.doc_fol_id
...so far, no luck. I'm still having only 655 rows returned (the 655 are those folders that HAVE document count > 0. Any folder that has zero documents in the document table just aren't being returned in the query.)
we're having a few tables which queries about 10.000 articles. As we don't show them all at once we are using pagination and use the rownum to show only a limited number of the results.
Now as these queries are pretty complex we have to optimize them and since we use pagination we have to call our query twice (first we make a count(*) and then we call the small resultset of a few rows). Ofcourse we are looking for a solution to call it only once and still use the pagination. We could load the whole resultset of 10.000 results and let java show only a few but that makes our line between the oracle and webserver pretty heavy. Is there a way to call the total number of results and give back only a small resultset just in one query?
I want the number of UNITS with the Status EN/PL for AREA 3/6
ID 1 has area 3 and 6 but only EN so count 1 (no PL) ID 2 has area 6 but DR so no count ID 3 has area 3 and 6 for EN and PL so 1 for each ID 4 has area 6 three times and 3 once so count.
CREATE TABLE DAN_T1 ( ID varchar(8), AREA varchar(8), UNIT varchar(8), STATUS varchar(8) )
In oracle query can i want find out how many day wise count for a year days (for example how may sundays, mondays, tuesdays, wednesdays ,thursdays,fridays,saturdays) in a given year (we can give the start day of the year and the end day of a year).
example ---------- jan sun-5 mon-4 tue-5 wed-5 thu-5 fri-4 sat-5 feb ------------do--------------------------------- like this for all 12 months at a single query.
I' m doing a query on multiple tables willing to get only top scorers from a certain round. Here's the relevant part of relation:
SOCCER_TEAM(TEAMID, NAME, CITY) PLAYER (PLAYERID, NAME_SURNAME, DOB, TEAMID) GAME_STATS(ROUNDID, GAMEID, TIME, PLAYERID, STATTYPE)
TIME is No between 1-90 representing the minute of the game STATTYPE is IN('GOAL', 'OWN GOAL', 'RED', 'YELLOW')
Here's my sql code for the query:
SELECT ROUNDID, NAME_SURNAME, NAME, COUNT(STATTYPE) FROM GAME_STATS, PLAYER, SOCCER_TEAM WHERE PLAYER.PLAYERID IN (SELECT GAME_STATS.PLAYERID FROM GAME_STATS WHERE STATTYPE='GOAL' AND PLAYER.TEAMID = SOCCER_TEAM.TEAMID) AND STATTYPE='GOAL' AND GAME_STATS.PLAYERID = PLAYER.PLAYERID GROUP BY ROUNDID, NAME_SURNAME, NAME ORDER BY ROUNDID, COUNT(STATTYPE) DESC
This results in correctly displaying all scorers from all the rounds, yet I haven't been able to construct the HAVING clause to display ONLY the top scorers from each round (there can be multiple of them scoring equal top amount of goals and I need to show them all)
p.s. I have underlined primary keys, while foreign keys are in cursive, if it is of any relevance
I would like to give back to the our application user a page of results for a given query along with the total result count, something like: "Showing 1-25 of 650 total results".
Currently I am doing this by submitting a second query:
select count(*) from (<previous query criteria>)
Is there a better performing approach I could be using?
