IR group by function and timestamp datatype

Is there any limitations on the group by function e.g. based on the datatype.
My problem\misunderstanding is with the IR:
USING "GROUP BY"-
I have a TIMESTAMP column (columnname TM_TIME) and I can schose it in the group by clause but not in the function section. Is there any reason why and could I get it to work.
regards
Thorsten
Edited by: Fischert on 02.05.2012 03:05

It really depends on the granularity that you need from the timestamp to make it meaningful. The key word is aggregation. So you should ask what level of aggregation do I need?
You can reduce the granularity from the fractional seconds to some lower level of granularity like seconds, minute, hours or even date (equivalent of trunc(date_column) using CAST or Truncating or to_date(to_char(...)) with appropriate format mask.
It just depends on the application and data.
E.g. for the LHC at CERN chasing the Higgins, timestamp is just not fine grained enough (you need 10 exp -23 or lower I guess !)
E.g. if you look at seismic data for oil exploration a hell of a lot happens in 5th and 6th decimal places in the timestamp.
But if you are looking at data logged by a normal SCADA system then maybe a second is detailed enough for the purpose.
In normal business application we are better off "rounding" the timestamp to some meaningful level for aggregation/ reporting.
Regards,

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Hi,
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5 WHERE s.department_id = e.department_id
6 ORDER BY s.department_id;
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           10 Whalen                          4400
           20 Hartstein                       9500
           20 Fay                             9500
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           30 Tobias                          4150
           30 Colmenares                      4150
           30 Himuro                          4150
           30 Baida                           4150
           30 Khoo                            4150
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CREATE TABLE tint_test (
msg VARCHAR2(25),
start_date TIMESTAMP WITH TIME ZONE,
end_date TIMESTAMP WITH TIME ZONE,
duration_1 INTERVAL DAY(5) TO SECOND,
duration_2 INTERVAL YEAR TO MONTH);
INSERT INTO tint_test
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VALUES
('my plane ride',
timestamp'2004-08-08 17:02:32.212 US/Eastern',
timestamp'2004-08-08 19:10:12.235 US/Pacific');
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duration_2 = (end_date - start_date) YEAR TO MONTH;
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SELECT t.*, end_date - start_date FROM tint_test t;

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Hello,
My issue is as follows:
1. I have one variable of type DATE, which I assign the value of SYSDATE
mydatevar DATE:= SYSDATE;2. I want to find *"today"*, truncated to DAY
TRUNC (mydatevar, 'DD')
TRUNC function returns DATE datatype. So I will receive in point 2 for example *'2010-01-13 00:00:00'*.
3. I want to assign the value from point 2 to a variable of type TIMESTAMP
mytimestampvar TIMESTAMP := mydatevar;which implicitly will convert the DATE variable to TIMESTAMP.
Problem: During the conversion (both implicit and explicit conversion with a format mask) I lose the "00" hours and "00" minutes and receive something like this: "10-JAN-13 *12*.00.00.000000000 AM".
Question: How can I convert from DATE to TIMESTAMP keeping hours and minutes zeros?
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NLS characteristics of the database:
PARAMETER                           VALUE
NLS_LANGUAGE                           AMERICAN
NLS_TERRITORY                   AMERICA
NLS_CURRENCY     $
NLS_ISO_CURRENCY                    AMERICA
NLS_NUMERIC_CHARACTERS     .,
NLS_CHARACTERSET                    AL32UTF8
NLS_CALENDAR                            GREGORIAN
NLS_DATE_FORMAT                    DD-MON-RR
NLS_DATE_LANGUAGE            AMERICAN
NLS_SORT     BINARY
NLS_TIME_FORMAT                     HH.MI.SSXFF AM
NLS_TIMESTAMP_FORMAT             DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT             HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT     DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY              $
NLS_COMP                             BINARY
NLS_LENGTH_SEMANTICS              BYTE
NLS_NCHAR_CONV_EXCP             FALSE
NLS_NCHAR_CHARACTERSET     AL16UTF16
NLS_RDBMS_VERSION             10.2.0.4.0Session parameters are the same.
DBTIMEZONE is "+02:00".

Verdi wrote:
Problem: During the conversion (both implicit and explicit conversion with a format mask) I lose the "00" hours and "00" minutes and receive something like this: "10-JAN-13 *12*.00.00.000000000 AM".I don't think you are necessarily losing any information whatsoever. It's probably more of a function of your NLS_TIMESTAMP_FORMAT and NLS_DATE_FORMAT. For example your NLS_DATE_FORMAT could be setup by default for a HH24 (24 hour time) which would report midnight as "00" hours. However, it looks like your NLS_TIMESTAMP_FORMAT is setup with a "HH" format with a meridian indicator which means 12 hours time.
Your comparisons should be using date/timestamp data types anyways so as long as the input value is converted properly into a date type this shouldn't matter anyways.
You can see what is actually stored by using the DUMP function:
SQL> SELECT DUMP(TO_TIMESTAMP(TO_CHAR(TRUNC(SYSDATE,'DD'),'MM/DD/YYYY HH:MI:SS AM'))) AS TSTAMP
2 ,       DUMP(TRUNC(SYSDATE,'DD')) AS DT
3 FROM DUAL
4 /
TSTAMP                                                                      DT
Typ=187 Len=20: 218,7,1,13,0,0,0,0,0,0,0,0,0,0,3,0,0,0,0,0                  Typ=13 Len=8: 218,7,1,13,0,0,0,0As you can see the TSTAMP and DT store nearly the same values (218,7,1,13), but the TSTAMP has more precision because of fractional seconds.
HTH!
Edited by: Centinul on Jan 13, 2010 7:23 AM

Overloading a DATE function with TIMESTAMP to avoid "too many declarations"

CREATE OR REPLACE PACKAGE util
AS
FUNCTION yn (bool IN BOOLEAN)
    RETURN CHAR;
FUNCTION is_same(a varchar2, b varchar2)
    RETURN BOOLEAN;
FUNCTION is_same(a date, b date)
    RETURN BOOLEAN;
/* Oracle's documentation says that you cannot overload subprograms
   * that have the same type family for the arguments. But,
   * apparently timestamp and date are in different type families,
   * even though Oracle's documentation says they are in the same one.
   * If we don't create a specific overloaded function for timestamp,
   * and for timestamp with time zone, we get "too many declarations
   * of is_same match" when we try to call is_same for timestamps.
FUNCTION is_same(a timestamp, b timestamp)
    RETURN BOOLEAN;
FUNCTION is_same(a timestamp with time zone, b timestamp with time zone)
    RETURN BOOLEAN;
/* These two do indeed cause problems, although there are no errors when we compile the package. Why no errors here? */
FUNCTION is_same(a integer, b integer) return boolean;
FUNCTION is_same(a real, b real) return boolean;
END util;
CREATE OR REPLACE PACKAGE BODY util
AS
     NAME: yn
     PURPOSE: pass in a boolean, get back a Y or N
FUNCTION yn (bool IN BOOLEAN)
    RETURN CHAR
IS
BEGIN
    IF bool
    THEN
      RETURN 'Y';
    END IF;
    RETURN 'N';
END yn;
     NAME: is_same
     PURPOSE: pass in two values, get back a boolean indicating whether they are
              the same. Two nulls = true with this function.
FUNCTION is_same(a in varchar2, b in varchar2)
    RETURN BOOLEAN
IS
    bool boolean := false;
BEGIN
    IF a IS NULL and b IS NULL THEN bool := true;
    -- explicitly set this to false if exactly one arg is null
    ELSIF a is NULL or b IS NULL then bool := false;
    ELSE bool := a = b;
    END IF;
    RETURN bool;
END is_same;
FUNCTION is_same(a in date, b in date)
    RETURN BOOLEAN
IS
    bool boolean := false;
BEGIN
    IF a IS NULL and b IS NULL THEN bool := true;
    -- explicitly set this to false if exactly one arg is null
    ELSIF a is NULL or b IS NULL then bool := false;
    ELSE bool := a = b;
    END IF;
    RETURN bool;
END is_same;
FUNCTION is_same(a in timestamp, b in timestamp)
    RETURN BOOLEAN
IS
    bool boolean := false;
BEGIN
    IF a IS NULL and b IS NULL THEN bool := true;
    -- explicitly set this to false if exactly one arg is null
    ELSIF a is NULL or b IS NULL then bool := false;
    ELSE bool := a = b;
    END IF;
    RETURN bool;
END is_same;
FUNCTION is_same(a in timestamp with time zone, b in timestamp with time zone)
    RETURN BOOLEAN
IS
    bool boolean := false;
BEGIN
    IF a IS NULL and b IS NULL THEN bool := true;
    -- explicitly set this to false if exactly one arg is null
    ELSIF a is NULL or b IS NULL then bool := false;
    ELSE bool := a = b;
    END IF;
    RETURN bool;
END is_same;
/* Don't bother to fully implement these two, as they'll just cause errors at run time anyway */
FUNCTION is_same(a integer, b integer) return boolean is begin return false; end;
FUNCTION is_same(a real, b real) return boolean is begin return false; end;
END util;
declare
d1 date := timestamp '2011-02-15 13:14:15';
d2 date;
t timestamp := timestamp '2011-02-15 13:14:15';
t2 timestamp;
a varchar2(10);
n real := 1;
n2 real;
begin
dbms_output.put_line('dates');
dbms_output.put_line(util.yn(util.is_same(d2,d2) ));
dbms_output.put_line(util.yn(util.is_same(d1,d2) ));
dbms_output.put_line('timestamps'); -- why don't these throw exception?
dbms_output.put_line(util.yn(util.is_same(t2,t2) ));
dbms_output.put_line(util.yn(util.is_same(t,t2) ));
dbms_output.put_line('varchars');
dbms_output.put_line(util.yn(util.is_same(a,a)));
dbms_output.put_line(util.yn(util.is_same(a,'a')));
dbms_output.put_line('numbers');
-- dbms_output.put_line(util.yn(util.is_same(n,n2))); -- this would throw an exception
end;
/Originally, I had just the one function with VARCHAR2 arguments. This failed to work properly because when dates were passed in, the automatic conversion to VARCHAR2 was dropping the timestamp. So, I added a 2nd function with DATE arguments. Then I started getting "too many declarations of is_same exist" error when passing TIMESTAMPs. This made no sense to me, so even though Oracle's documentation says you cannot do it, I created a 3rd version of the function, to handle TIMESTAMPS explicitly. Surprisingly, it works fine. But then I noticed it didn't work with TIMESTAMP with TIME ZONEs. Hence, the fourth version of the function. Oracle's docs say that if your arguments are of the same type family, you cannot create an overloaded function, but as the example above shows, this is very wrong.
Lastly, just for grins, I created the two number functions, one with NUMBER, the other with REAL, and even these are allowed - they compile. But then at run time, it fails. I'm really confused.
Here is the apparently incorrect Oracle documentation on the matter: http://docs.oracle.com/cd/B12037_01/appdev.101/b10807/08_subs.htm (see overloading subprogram names), and here are the various types and their families: http://docs.oracle.com/cd/E11882_01/appdev.112/e17126/predefined.htm.
Edited by: hotwater on Jan 9, 2013 3:38 PM
Edited by: hotwater on Jan 9, 2013 3:46 PM

>
So, I added a 2nd function with DATE arguments. Then I started getting "too many declarations of is_same exist" error when passing TIMESTAMPs. This made no sense to me
>
That is because when you pass a TIMESTAMP Oracle cannot determine whether to implicitly convert it to VARCHAR2 and use your first function or implicitly convert it to DATE and use your second function. Hence the 'too many declarations' exist error.
>
, so even though Oracle's documentation says you cannot do it, I created a 3rd version of the function, to handle TIMESTAMPS explicitly. Surprisingly, it works fine. But then I noticed it didn't work with TIMESTAMP with TIME ZONEs.
>
Possibly because of another 'too many declarations' error? Because now there would be THREE possible implicit conversions that could be done.
>
Hence, the fourth version of the function. Oracle's docs say that if your arguments are of the same type family, you cannot create an overloaded function, but as the example above shows, this is very wrong.
>
I think the documentation, for the 'date' family, is wrong as you suggest. For INTEGER and REAL the issue is that those are ANSI data types and are really the same Oracle datatype; they are more like 'aliases' than different datatypes.
See the SQL Language doc
>
ANSI, DB2, and SQL/DS Datatypes
SQL statements that create tables and clusters can also use ANSI datatypes and datatypes from the IBM products SQL/DS and DB2. Oracle recognizes the ANSI or IBM datatype name that differs from the Oracle Database datatype name. It converts the datatype to the equivalent Oracle datatype, records the Oracle datatype as the name of the column datatype, and stores the column data in the Oracle datatype based on the conversions shown in the tables that follow.
INTEGER
INT
SMALLINT
NUMBER(38)
FLOAT (Note b)
DOUBLE PRECISION (Note c)
REAL (Note d)
FLOAT(126)
FLOAT(126)
FLOAT(63)

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[http://www.orafaq.com/forum/t/128331/98870/]
Hi,
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      v_start NUMBER := 1;
     v_index NUMBER;
      V_temp NUMBER(10,0):=0;
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WHILE(v_start <= v_length)
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         V_temp:=V_temp+1;
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       ELSE
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       END IF;
     END LOOP;
    return;
   end Split_new1;Here attached link contains the procedure trying to execute the function with huge string more than 400kb.
Could you pls let me know how to do the same in sqlplus and toad.
Thanks in advance.
Edited by: user512743 on Nov 27, 2008 4:31 AM

BluShadow wrote:
The problem is that in your execution of this you are trying to assign a value to the clob variable using
v_clob := '<string>'
where the string is greater than allowed in PL/SQL.
Whilst the CLOB itself can hold more data, the string is actually the equivalent of a VARCHAR2 so cannot exceed VARCHAR2 limits.
You should use the DBMS_LOB package to append data to your CLOB in chunks of no more than 32767 characters at a time.??? PL/SQL provides full CLOB support. There is no need to use DBMS_LOB (although you could). OP's function has logic errors. Anyway:
SQL> create or replace type split_obj as object
2    (
3      occurence_id number(10,0),
4      splitvalue varchar2(1000)
5    );
6 /
Type created.
SQL> create or replace type split_rec as table of split_obj;
2 /
Type created.
SQL> create or replace
2    FUNCTION Split_new1(
3                        p_string IN clob,
4                        p_delimiter IN VARCHAR2
5                       )
6      return split_rec pipelined
7      is
8          v_length NUMBER := length(p_string);
9          v_start NUMBER := 1;
10          v_end    NUMBER;
11          V_id     NUMBER :=0;
12          v_clob   CLOB   := p_string || p_delimiter;
13      begin
14          while(v_start <= v_length) loop
15            v_end := instr(v_clob, p_delimiter, v_start);
16            v_id := v_id + 1;
17            pipe row(split_obj(v_id,substr(p_string,v_start,v_end - v_start)));
18            v_start := v_end + length(p_delimiter);
19          end loop;
20          return;
21 end Split_new1;
22 /
Function created.
SQL> create table test_table(x clob)
2 /
Table created.
SQL> declare
2      c clob;
3 begin
4      for i in 1..26 loop
5        c := c || lpad(chr(ascii('a') + i - 1),1000,chr(ascii('a') + i - 1)) || ',';
6      end loop;
7      for i in 1..26 loop
8        c := c || lpad(chr(ascii('A') + i - 1),1000,chr(ascii('A') + i - 1)) || ',';
9      end loop;
10      for i in 1..26 loop
11        c := c || lpad(chr(ascii('a') + i - 1),1000,chr(ascii('a') + i - 1)) || ',';
12      end loop;
13      for i in 1..26 loop
14        if i > 1 then c := c || ','; end if;
15        c := c || lpad(chr(ascii('A') + i - 1),1000,chr(ascii('A') + i - 1));
16      end loop;
17      insert into test_table
18        values(c);
19 end;
20 /
PL/SQL procedure successfully completed.
SQL> select length(x)
2    from test_table
3 /
LENGTH(X)
    104103
SQL> select t.occurence_id,
2          length(splitvalue) len,
3          substr(splitvalue,1,20) first_20
4    from test_table,
5          table(Split_new1(x,',')) t
6 /
OCCURENCE_ID        LEN FIRST_20
           1       1000 aaaaaaaaaaaaaaaaaaaa
           2       1000 bbbbbbbbbbbbbbbbbbbb
           3       1000 cccccccccccccccccccc
           4       1000 dddddddddddddddddddd
           5       1000 eeeeeeeeeeeeeeeeeeee
           6       1000 ffffffffffffffffffff
           7       1000 gggggggggggggggggggg
           8       1000 hhhhhhhhhhhhhhhhhhhh
           9       1000 iiiiiiiiiiiiiiiiiiii
          10       1000 jjjjjjjjjjjjjjjjjjjj
          11       1000 kkkkkkkkkkkkkkkkkkkk
OCCURENCE_ID        LEN FIRST_20
          12       1000 llllllllllllllllllll
          13       1000 mmmmmmmmmmmmmmmmmmmm
          14       1000 nnnnnnnnnnnnnnnnnnnn
          15       1000 oooooooooooooooooooo
          16       1000 pppppppppppppppppppp
          17       1000 qqqqqqqqqqqqqqqqqqqq
          18       1000 rrrrrrrrrrrrrrrrrrrr
          19       1000 ssssssssssssssssssss
          20       1000 tttttttttttttttttttt
          21       1000 uuuuuuuuuuuuuuuuuuuu
          22       1000 vvvvvvvvvvvvvvvvvvvv
OCCURENCE_ID        LEN FIRST_20
          23       1000 wwwwwwwwwwwwwwwwwwww
          24       1000 xxxxxxxxxxxxxxxxxxxx
          25       1000 yyyyyyyyyyyyyyyyyyyy
          26       1000 zzzzzzzzzzzzzzzzzzzz
          27       1000 AAAAAAAAAAAAAAAAAAAA
          28       1000 BBBBBBBBBBBBBBBBBBBB
          29       1000 CCCCCCCCCCCCCCCCCCCC
          30       1000 DDDDDDDDDDDDDDDDDDDD
          31       1000 EEEEEEEEEEEEEEEEEEEE
          32       1000 FFFFFFFFFFFFFFFFFFFF
          33       1000 GGGGGGGGGGGGGGGGGGGG
OCCURENCE_ID        LEN FIRST_20
          34       1000 HHHHHHHHHHHHHHHHHHHH
          35       1000 IIIIIIIIIIIIIIIIIIII
          36       1000 JJJJJJJJJJJJJJJJJJJJ
          37       1000 KKKKKKKKKKKKKKKKKKKK
          38       1000 LLLLLLLLLLLLLLLLLLLL
          39       1000 MMMMMMMMMMMMMMMMMMMM
          40       1000 NNNNNNNNNNNNNNNNNNNN
          41       1000 OOOOOOOOOOOOOOOOOOOO
          42       1000 PPPPPPPPPPPPPPPPPPPP
          43       1000 QQQQQQQQQQQQQQQQQQQQ
          44       1000 RRRRRRRRRRRRRRRRRRRR
OCCURENCE_ID        LEN FIRST_20
          45       1000 SSSSSSSSSSSSSSSSSSSS
          46       1000 TTTTTTTTTTTTTTTTTTTT
          47       1000 UUUUUUUUUUUUUUUUUUUU
          48       1000 VVVVVVVVVVVVVVVVVVVV
          49       1000 WWWWWWWWWWWWWWWWWWWW
          50       1000 XXXXXXXXXXXXXXXXXXXX
          51       1000 YYYYYYYYYYYYYYYYYYYY
          52       1000 ZZZZZZZZZZZZZZZZZZZZ
          53       1000 aaaaaaaaaaaaaaaaaaaa
          54       1000 bbbbbbbbbbbbbbbbbbbb
          55       1000 cccccccccccccccccccc
OCCURENCE_ID        LEN FIRST_20
          56       1000 dddddddddddddddddddd
          57       1000 eeeeeeeeeeeeeeeeeeee
          58       1000 ffffffffffffffffffff
          59       1000 gggggggggggggggggggg
          60       1000 hhhhhhhhhhhhhhhhhhhh
          61       1000 iiiiiiiiiiiiiiiiiiii
          62       1000 jjjjjjjjjjjjjjjjjjjj
          63       1000 kkkkkkkkkkkkkkkkkkkk
          64       1000 llllllllllllllllllll
          65       1000 mmmmmmmmmmmmmmmmmmmm
          66       1000 nnnnnnnnnnnnnnnnnnnn
OCCURENCE_ID        LEN FIRST_20
          67       1000 oooooooooooooooooooo
          68       1000 pppppppppppppppppppp
          69       1000 qqqqqqqqqqqqqqqqqqqq
          70       1000 rrrrrrrrrrrrrrrrrrrr
          71       1000 ssssssssssssssssssss
          72       1000 tttttttttttttttttttt
          73       1000 uuuuuuuuuuuuuuuuuuuu
          74       1000 vvvvvvvvvvvvvvvvvvvv
          75       1000 wwwwwwwwwwwwwwwwwwww
          76       1000 xxxxxxxxxxxxxxxxxxxx
          77       1000 yyyyyyyyyyyyyyyyyyyy
OCCURENCE_ID        LEN FIRST_20
          78       1000 zzzzzzzzzzzzzzzzzzzz
          79       1000 AAAAAAAAAAAAAAAAAAAA
          80       1000 BBBBBBBBBBBBBBBBBBBB
          81       1000 CCCCCCCCCCCCCCCCCCCC
          82       1000 DDDDDDDDDDDDDDDDDDDD
          83       1000 EEEEEEEEEEEEEEEEEEEE
          84       1000 FFFFFFFFFFFFFFFFFFFF
          85       1000 GGGGGGGGGGGGGGGGGGGG
          86       1000 HHHHHHHHHHHHHHHHHHHH
          87       1000 IIIIIIIIIIIIIIIIIIII
          88       1000 JJJJJJJJJJJJJJJJJJJJ
OCCURENCE_ID        LEN FIRST_20
          89       1000 KKKKKKKKKKKKKKKKKKKK
          90       1000 LLLLLLLLLLLLLLLLLLLL
          91       1000 MMMMMMMMMMMMMMMMMMMM
          92       1000 NNNNNNNNNNNNNNNNNNNN
          93       1000 OOOOOOOOOOOOOOOOOOOO
          94       1000 PPPPPPPPPPPPPPPPPPPP
          95       1000 QQQQQQQQQQQQQQQQQQQQ
          96       1000 RRRRRRRRRRRRRRRRRRRR
          97       1000 SSSSSSSSSSSSSSSSSSSS
          98       1000 TTTTTTTTTTTTTTTTTTTT
          99       1000 UUUUUUUUUUUUUUUUUUUU
OCCURENCE_ID        LEN FIRST_20
         100       1000 VVVVVVVVVVVVVVVVVVVV
         101       1000 WWWWWWWWWWWWWWWWWWWW
         102       1000 XXXXXXXXXXXXXXXXXXXX
         103       1000 YYYYYYYYYYYYYYYYYYYY
         104       1000 ZZZZZZZZZZZZZZZZZZZZ
104 rows selected.
SQL> As you can see, function works OK without DBMS_LOB on CLOB of 104103 bytes.
SY.

Few questions about sql2008 functions and commands

hello,
I am learning sql2008 implementation and maintenance,I am just 2 weeks bussy.there is some questions in my mind wich I can't answer it.
1-when I can use USE MASTER statement
2-can a database for example (test) have many and unlimmited file groups?
3-what is the diferrence between file and filegroup! is the term of file means tables in filegroup?
4-with boundary points does mean the data type when creating partition function!
5`what is diferrence between full text index and index,where you have to use the index and wher you have to use full text index?
6-each filegroup must have one partition or one partition can have many filegroups in partition scheme!
7-do you have to partition every scheme or not! where do you have to partition a scheme and where not?
8-can you give a little example with switch operator!
9-again do you have to partition every table and index in the real world or not!
thanks
johan
h.david

Hi,
Let me try to answer your questions:
You need to use USE MASTER whenever you need to do some work in the MASTER database and the database context is not that.
Yes, a database can have many filegroups. Please check this article:
http://msdn.microsoft.com/en-us/library/ms179316.aspx
Please check this article:
http://msdn.microsoft.com/en-us/library/ms179316.aspx
As per BOL:
boundary_value is a constant expression that can reference variables. This includes user-defined type variables, or functions and user-defined functions. It cannot reference Transact-SQL expressions.
boundary_value must either match or be implicitly convertible to the data type supplied in
input_parameter_type, and cannot be truncated during implicit conversion in a way that the size and scale of the value does not match that of its corresponding
input_parameter_type. For more details check
http://msdn.microsoft.com/en-us/library/ms187802.aspx
For simplicity: Full-Text index is used to search in a LOB/text data in a column, index is used to speed up your queries. Please check these articles:
http://msdn.microsoft.com/en-us/library/ms142571.aspx,
http://msdn.microsoft.com/en-us/library/ms189271.aspx
As per BOL: When you create a partition scheme, you define the filegroups where the table partitions are mapped, based on the parameters of the partition function. You must specify enough filegroups to hold the number of partitions. You can specify that
all partitions map to a different filegroup, that some partitions map to a single filegroup, or that all partitions map to a single filegroup. You can also specify additional, "unassigned" filegroups in the event you want to add more partitions later. For
more info, please check
http://msdn.microsoft.com/en-us/library/ms188730.aspx
8. Please read the concept of partitioning here:
http://msdn.microsoft.com/en-us/library/ms190199.aspx and for SWITCH operator, please check the sliding window example at here:
http://msdn.microsoft.com/en-us/library/aa964122(SQL.90).aspx
9. It depends :) but you always will have at least 1 partition!
I hope it helps.
J.
There are 10 type of people. Those who understand binary and those who do not.

Sort order for group by functions

I have table TAB1(notenum number, linenum number, linetext varchar2(100)).
Each note can have multiple lines of text. Eg data
NOTENUM     LINENUM     LINETEXT
1     1     THIS IS LINE1.
1     2     THIS IS LINE2.
2     1     THIS IS LINE1 OF NOTE2.
2     2     THIS IS LINE2 OF NOTE2.
I need the text of lines of the most recent note (max notenum)
<Note>THIS IS LINE1 OF NOTE2. THIS IS LINE2 OF NOTE2</Note>.
I have a query like this
SELECT XMLAGG(XMLPARSE(CONTENT LINETEXT WELLFORMED))
FROM TAB1
GROUP BY NOTENUM
ORDER BY NOTENUM DESC
Above query would return the text of all lines concatenated for each note and the first row would be the one with highest notenum value.
My problem is that concatenation of the LINETEXT should happen in ascending order of LINENUM. Since LINENUM is not in GROUP BY clause I cannot specify it in ORDER BY.
How can I specify to XMLAGG (for that matter any group by function) to concatenate text in a specific order.
I hope I was able to explain my problem clear enough for somebody to help.
thanks for all the help
Message was edited by:
user448703
Message was edited by:
user448703

Never mind. I just found out that XMLAGG function has the option to specify ORDER BY. I think that will work.

IR group by function and timestamp datatype

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