Dynamic pivot in oracle sql
... pivot (sum(A) for B in (X))
Now B is of datatype varchar2 and X is a string of varchar2 values separated by commas. Values for X are select distinct values from a column(say CL) of same table. This way pivot query was working.
But the problem is that whenever there is a new value in column CL I have to manually add that to the string X.
I tried replacing X with select distinct values from CL. But query is not running. The reason I felt was due to the fact that for replacing X we need values separated by commas. Then i created a function to return exact output to match with string X. But query still doesn't run. The error messages shown are like "missing righr parantheses", "end of file communication channel" etc etc. I tried pivot xml instead of just pivot, the query runs but gives vlaues like oraxxx etc which are no values at all.
Maybe I am not using it properly. Can you tell me some method to create a pivot with dynamic values?
You can't put a non constant string in the IN clause of the pivot clause. You can use Pivot XML for that.
subquery A subquery is used only in conjunction with the XML keyword. When you specify a subquery, all values found by the subquery are used for pivoting
It should look like this:
select xmlserialize(content t.B_XML) from t_aa pivot xml( sum(A) for B in(any) ) t;
You can also have a subquery instead of the ANY keyword:
select xmlserialize(content t.B_XML) from t_aa pivot xml( sum(A) for B in (select cl from t_bb) ) t;
You cannot put a dynamic statement in the PIVOT's IN statement without using PIVOT XML, which outputs some less than desirable output. However, you can create an IN string and input it into your statement.
First, here is my sample table;
myNumber myValue myLetter ---------- ---------- -------- 1 2 A 1 4 B 2 6 C 2 8 A 2 10 B 3 12 C 3 14 A
clear columns COLUMN temp_in_statement new_value str_in_statement SELECT DISTINCT LISTAGG('''' || myLetter || ''' AS ' || myLetter,',') WITHIN GROUP (ORDER BY myLetter) AS temp_in_statement FROM (SELECT DISTINCT myLetter FROM myTable);
Your string will look like:
'A' AS A,'B' AS B,'C' AS C
Now use the String statement in your PIVOT query.
SELECT * FROM (SELECT myNumber, myLetter, myValue FROM myTable) PIVOT (Sum(myValue) AS val FOR myLetter IN (&str_in_statement));
Here is the Output:
MYNUMBER A_VAL B_VAL C_VAL ---------- ---------- ---------- ---------- 1 2 4 2 8 10 6 3 14 12
There are limitations though. You can only concatenate a string up to 4000 bytes.
For later readers, here is another solution https://technology.amis.nl/2006/05/24/dynamic-sql-pivoting-stealing-antons-thunder/
allowing a query like
select * from table( pivot( 'select deptno, job, count(*) c from scott.emp group by deptno,job' ) )
USE DYNAMIC QUERY
Test code is below
-- DDL for Table TMP_TEST -------------------------------------------------------- CREATE TABLE "TMP_TEST" ( "NAME" VARCHAR2(20), "APP" VARCHAR2(20) ); / SET DEFINE OFF; Insert into TMP_TEST (NAME,APP) values ('suhaib','2'); Insert into TMP_TEST (NAME,APP) values ('suhaib','1'); Insert into TMP_TEST (NAME,APP) values ('shahzad','3'); Insert into TMP_TEST (NAME,APP) values ('shahzad','2'); Insert into TMP_TEST (NAME,APP) values ('shahzad','5'); Insert into TMP_TEST (NAME,APP) values ('tariq','1'); Insert into TMP_TEST (NAME,APP) values ('tariq','2'); Insert into TMP_TEST (NAME,APP) values ('tariq','6'); Insert into TMP_TEST (NAME,APP) values ('tariq','4'); / CREATE TABLE "TMP_TESTAPP" ( "APP" VARCHAR2(20) ); SET DEFINE OFF; Insert into TMP_TESTAPP (APP) values ('1'); Insert into TMP_TESTAPP (APP) values ('2'); Insert into TMP_TESTAPP (APP) values ('3'); Insert into TMP_TESTAPP (APP) values ('4'); Insert into TMP_TESTAPP (APP) values ('5'); Insert into TMP_TESTAPP (APP) values ('6'); / create or replace PROCEDURE temp_test( pcursor out sys_refcursor, PRESULT OUT VARCHAR2 ) AS V_VALUES VARCHAR2(4000); V_QUERY VARCHAR2(4000); BEGIN PRESULT := 'Nothing'; -- concating activities name using comma, replace "'" with "''" because we will use it in dynamic query so "'" can effect query. SELECT DISTINCT LISTAGG('''' || REPLACE(APP,'''','''''') || '''',',') WITHIN GROUP (ORDER BY APP) AS temp_in_statement INTO V_VALUES FROM (SELECT DISTINCT APP FROM TMP_TESTAPP); -- designing dynamic query V_QUERY := 'select * from ( select NAME,APP from TMP_TEST ) pivot (count(*) for APP in (' ||V_VALUES|| ')) order by NAME' ; OPEN PCURSOR FOR V_QUERY; PRESULT := 'Success'; Exception WHEN OTHERS THEN PRESULT := SQLcode || ' - ' || SQLERRM; END temp_test;
I used the above method (Anton PL/SQL custom function pivot()) and it done the job! As I am not a professional Oracle developer, these are simple steps I've done:
1) Download the zip package to find pivotFun.sql in there. 2) Run once the pivotFun.sql to create a new function 3) Use the function in normal SQL.
Just be careful with dynamic columns names. In my environment I found that column name is limited with 30 characters and cannot contain a single quote in it. So, my query is now something like this:
SELECT * FROM table( pivot(' SELECT DISTINCT P.proj_id, REPLACE(substr(T.UDF_TYPE_LABEL, 1, 30), '''''''','','') as Attribute, CASE WHEN V.udf_text is null and V.udf_date is null and V.udf_number is NOT null THEN to_char(V.udf_number) WHEN V.udf_text is null and V.udf_date is NOT null and V.udf_number is null THEN to_char(V.udf_date) WHEN V.udf_text is NOT null and V.udf_date is null and V.udf_number is null THEN V.udf_text ELSE NULL END AS VALUE FROM project P LEFT JOIN UDFVALUE V ON P.proj_id = V.proj_id LEFT JOIN UDFTYPE T ON V.UDF_TYPE_ID = T.UDF_TYPE_ID WHERE P.delete_session_id IS NULL AND T.TABLE_NAME = ''PROJECT'' ') )
Works well with up to 1m records.
I am not exactly going to give answer for the question OP has asked, instead I will be just describing how dynamic pivot can be done.
Here we have to use dynamic sql, by initially retrieving the column values into a variable and passing the variable inside dynamic sql.
Consider we have a table like below.
If we need to show the values in the column YR as column names and the values in those columns from QTY, then we can use the below code.
declare sqlqry clob; cols clob; begin select listagg('''' || YR || ''' as "' || YR || '"', ',') within group (order by YR) into cols from (select distinct YR from EMPLOYEE); sqlqry := ' select * from ( select * from EMPLOYEE ) pivot ( MIN(QTY) for YR in (' || cols || ') )'; execute immediate sqlqry; end; /
If required, you can also create a temp table and do a select query in that temp table to see the results. Its simple, just add the CREATE TABLE TABLENAME AS in the above code.
sqlqry := ' CREATE TABLE TABLENAME AS select * from