I need to write a query in plsql to select records for first 3 distinct values of a single column (below example, ID )and all the rows for next 3 distinct values of the column and so on till the end of count of distinct values of a column.
eg: ID name age 1 abc 10 1 def 20 2 ghi 10 2 jkl 20 2 mno 60 3 pqr 10 4 rst 10 4 tuv 10 5 vwx 10 6 xyz 10 6 hij 10 7 lmn 10 . . . so on... (till some count) Result should be Query 1 should result ---> ID name age 1 abc 10 1 def 20 2 ghi 10 2 jkl 20 2 mno 60 3 pqr 10
query 2 should result --> 4 rst 10 4 tuv 10 5 vwx 10 6 xyz 10 6 hij 10
query 3 should result --> 7 lmn 10 . . 9 .. .. so on..
I've read so many different pages on this topic but I can't seem to get my query the way it needs to be. Here's the query:
select admitnbr, lastname||', '||firstname||' '||finitial, hphone, mobile, wphone, med_rec, dob from patients join schedule using (key_patien) join adtmirro using (key_patien) where appt_state = 'ON HOLD'
Because patients in my database can have multiple appointments "on hold" there are duplicates in the results. I only need 1 record per patient in order to forward this information into an automated dialer to contact that patient. I do NOT want to call the patient over and over again. Once will suffice. I'm trying to make a distinction on the column 'med_rec'. One row per 'med_rec' will be awesome but I can't find a way to create a distinct on that column.
SELECT DISTINCT a.emp_id, a.cal_id, TO_CHAR(a.ts_date, 'DD/MM/YYYY') tsdate, a.ts_date, 1 as days FROM tmsh_timesheet a INNER JOIN project b ON TO_CHAR(b.proj_id) = a.proj_id INNER JOIN tmsh_ts_calendar c ON c.cal_id = a.cal_id INNER JOIN (SELECT a.cal_id, a.emp_id, MAX(a.status) as status, a.create_dt, a.create_by FROM tmsh_stat_hist a
I have a select statement that selects all columns from the join of 3 oracle views. I would like to change it to select only the distinct rows, not sure how to code this. Here is my sql statement:
select * from myschema.view_1 acct Left JOIN myschema.view_2 freq
Having production system: 11.2.0.1 on Windows Server x64 Test system: 9.2.0.1 on Windows XP
Problem preface: to get all unique CASEID which should be checked up by biometric system.What i should check - all CASEs for different PERSONs having same PHONEs at least among one phone type (1..4).Real table contains little bit more than 10 million records.I made test scripts.
Below the DDL for test table creation: ------------------------------------------ -- Create CASEINFO test table ------------------------------------------ DROP TABLE CASEINFO; CREATE TABLE CASEINFO
[code]...
Below i've put SQL/DLL to make test data.number of records inserted 2 millions. PERSON_COUNT := #/8; ------------------------------------------ -- fill CASEINFO with sample data ------------------------------------------ DECLARE I INTEGER;
[code]...
Below SQL select to check the data in created table. ------------------------------------------ -- Check test data counters ------------------------------------------ SELECT 'TOTAL',count(*) from CASEINFO UNION ALL SELECT 'LEGAL',count(*) from CASEINFO where
[code]...
The PROBLEM is that i am experiencing HUGE perfomance problems on both test and production systems with that query:
select distinct b.caseid from CASEINFO a, CASEINFO b where (a.person<>b.person) and (a.sex=b.sex) and ( (a.phone1=b.phone1) or (a.phone1=b.phone2) or (a.phone1=b.phone3) or
[code]...
This query takes almost 90 minutes to execute.And i do not know how to avoid this.Full SQL file to make test attached.
I am only able to extract only 4000 characters from the clob column "DESCRIPTION".how to get more characters or max for that column with the same query concept?
I need to select multiple columns but only have 2 of them which are distinct. For instance if i have
userid lastname firstname city country time 1 jones tom lon gb 2:25 2 wall paul la usa 2:30 1 jones tom lon gb 2:50 3 smith jane ny usa 2:55
what i would want to do is select all the columns but avoid duplicate lastname-firstname combination rows. The problem is if i use a group by i have to include all the columns and because time is different i will get tom jones twice. a way of getting round this so i can select all the columns but only 1 row of tom jones.
I had to create a new column in a particular table now i want to insert the values in that column though the other columns are already populated I entered the command (insert into Product(STANDARD_PRICE) values(895.99) when i hit return it says cannot enter null value into (SYSTEM .PRODUCT. PRODUCT_ID) product_id is the PK which is the first column STANDARD_PRICE is the last column in my table...how do i enter the values into that column without receiving this error or having to effect the other columns?
I have a column SIX_NO with numbers and null values in it and I would want to display the column with the highest number first and others, in a descending order. I have used the below code
select * from (select six_no from table_name order by six_no desc ) where rownum <=5;
this is the table i have in which repeated itemids for different dates,for example itemid 205 and 203 comes 2 times because that item was consumed again and again in a different date. like this the table data has more than a 20 thousand records;
In which i need to select the last updated dates itemid from this table, because same item id could be consumed 'n' number of times so i need to select it as per the last date or latest dates itemid from this table for each and every item, so how can i select it?
If there are 100 colums or above in a table and we dont want select a single(any one) column from those 100 columns. is there any command or function to do this in oracle.
I can do it by writting names of all 99 columns but as this method is lenghty, so need some efficient way to do this.
like in SQL server we have a "except" keyword through which we can rule out the columns .
ex: select * except (column_name1,column_name_2) from Table_name.
I have a requirement of getting different column value for every select clause. my selection is so much freequent. For example.. 10 Select statement /second.
But when if I am running more than select in a second its is showing the same record which is last dequeue.and also tried with RANDOM(). how to get different value for every statement which is running in single point of time.
In a select query, I want to substitute the column name from a variable (In turn from an array of column names). Details are given below. I am getting an error as mentioned below.
Insert Into Test1 values(10,'Thomas','Manager','LA'); Insert Into Test1 values(11,'George','Chairman','LA');
declare MTest1Test1%RowType; str1VarChar2(1000):='Name'; MValue1Varchar2(100); begin Select * Into MTest1 from Test1 where ID=10; str1:='Select MTest1.'||str1||' from dual'; execute immediate str1 into mvalue1; dbms_output.put_line('mvalue1 '||mvalue1); end; /
I am getting the error:
ORA-00904: "MTEST1"."NAME": invalid identifier ORA-06512: at line 9
explain slow performance of multicolumn indexes on oracle 11g R2 observed in the following scenario? A multi-column index (b-tree index) not partitioned, not unique, not reversed with 3 columns.
A series of queries are run using all 3 columns. The performance hit comes when the first order column values changes. So, maybe after 10 select queries the value changes. The 2nd and 3rd order columns are changing throughout the series of select calls, but no performance bottleneck it hit then.
I am trying to come up with a sql select statement that provides all rows for employees with 2 or more cities.
with sample_table as ( select 'John' name,'city' ValueType,'Toronto' Value from dual union all select 'John' name,'city' ValueType,'Vancouver' Value from dual union all select 'Susan' name,'city' ValueType,'Toronto' Value from dual union all select 'Susan' name,'city' ValueType,'Seattle' Value from dual union all select 'Susan' name,'age' ValueType,30 Value from dual union all select 'Susan' name,'city' ValueType,'Atlanta' Value from dual union all
[Code]...
NAME VALUETYPE VALUE ----------- ------------- ------------ John City Toronto John City Vancouver Susan City Toronto Susan City Seattle Susan Age 30 Susan City Atlanta David City Chicago David age 35 David Status married David City Dallas
The above code is just to describe the sample table and the desired result set. Please note that Mary is not on the result set since she has no city assigned to her. Also Julia is not on the result set since she only has one city assigned to her. The others are there because they had at least 2 cities assigned to them.
I need the sql syntax that would return this result set.
I'm trying to select id's in a table that have 2 certain values for another column. Example below explains:
idCoupon Type 123Amount 123Percent 456Amount 789Percent
I would like to write a sql statement that would select all rows where id=123, because id 123 has both coupon types "Amount" and "Percent". So the result set of the sql statement would look like: