I was trying to order a result set by the order of the values in an IN() clause.
SELECT * FROM CrossReference WHERE cross_reference_id IN (SELECT Id FROM FilteredIds)
So I tried to find a function such as MySql FIELD(). Then I found these answers (answer1, answer2) which explain how to do the exact thing on SQLite using the INSTR().
SELECT *, INSTR(',GDBR10,GDBR5,GDBR30,', ',' || ticker || ',') POS
FROM tbl
WHERE POS>0
ORDER BY POS;
So it's working as expected, but I want to populate the ids dynamically using a select query. I tried many approaches, but nothing seemed to work. Here is the last one I tried. It gave me just one result row (a result related to the first filterId).
SELECT *, INSTR (','||(SELECT id FROM FilteredIds)||',', ',' || cross_reference_id || ',') POS FROM CrossReference WHERE POS>0 ORDER BY POS;
So I guess I'm making some kind of mistake when concatenating the SELECT query with the rest of the code. Because when I manually enter the filtered Ids it works and returns results according to the entered filter ids.
Related
I am trying to use an Insert, Sequence and Select * to work together.
INSERT INTO BRK_INDV
Select * from (Select brk_seq.NEXTVAL as INDV_SEQ, a.*
FROM (select to_date(to_char(REQUEST_DATETIME,'DD-MM-YYYY'),'DD-MM-YYYY') BUSINESS_DAY, to_char(REQUEST_DATETIME,'hh24') src_hour,
CASE tran_type
WHEN 'V' THEN 'Visa'
WHEN 'M' THEN 'MasterCard'
ELSE tran_type
end text,
tran_type, count(*) as count
from DLY_STATS
where 1=1
AND to_date(to_char(REQUEST_DATETIME,'DD-MM-YYYY'),'DD-MM-YYYY') = '09-FEB-2015'
group by to_date(to_char(REQUEST_DATETIME,'DD-MM-YYYY'),'DD-MM-YYYY'),to_char(REQUEST_DATETIME,'hh24'),tran_type order by src_hour)a);
This gives me the following error:
ERROR at line 2:
ORA-02287: sequence number not allowed here
I tried to remove the order by and still the same error.
However, if I only run
Select brk_seq.NEXTVAL as INDV_SEQ, a.*
FROM (select to_date(to_char(REQUEST_DATETIME,'DD-MM-YYYY'),'DD-MM-YYYY') BUSINESS_DAY, to_char(REQUEST_DATETIME,'hh24') src_hour,
CASE tran_type
WHEN 'V' THEN 'Visa'
WHEN 'M' THEN 'MasterCard'
ELSE tran_type
end text,
tran_type, count(*) as count
from DLY_STATS
where 1=1
AND to_date(to_char(REQUEST_DATETIME,'DD-MM-YYYY'),'DD-MM-YYYY') = '09-FEB-2015'
group by to_date(to_char(REQUEST_DATETIME,'DD-MM-YYYY'),'DD-MM-YYYY'),to_char(REQUEST_DATETIME,'hh24'),tran_type order by src_hour)a;
It shows me proper entries. Then, why is select * not working for that?
Kindly help.
I see what you're trying to do. You want to insert rows into the BRK_INDV table in a particular order. The sequence number, which I assume will be the primary key of BRK_INDV, will be generated sequentially in the sorted order of the input rows.
You are working with a relational database. One of the first characteristics we all learn about a relational database is that the order of the rows in a table is insignificant. That's just a fancy word for fugitaboutit.
You cannot assume that a select * from table will return the rows in the same order they were written. It might. It might for quite a long time. Then something -- the number of rows, the grouping of some column values, the phase of the moon -- something will change and you will get them out in a seemingly totally random order.
If you want order, it must be imposed in the query, not the insert.
Here's the statement you should be executing:
INSERT INTO BRK_INDV
With
Grouped( Business_Day, Src_Hour, Text, Tran_Type, Count )As(
Select Trunc( Request_Datetime ) Business_Day,
To_Char( Request_Datetime, 'hh24') Src_Hour,
Case Tran_Type
When 'V' Then 'Visa'
When 'M' Then 'MasterCard'
Else Tran_Type
end Text,
Tran_Type, count(*) as count
from DLY_STATS
Where 1=1 --> Generated as dynamic SQL?
And Request_Datetime >= Date '2015-02-09'
And Request_Datetime < Date '2015-02-10'
Group By Trunc( Request_Datetime ), To_Char( Request_Datetime, 'hh24'), Tran_Type
)
Select brk_seq.Nextval Indv_Seq, G.*
from Grouped G;
Notice there is no order by. If you want to see the generated rows in a particular order:
select * from Brk_Indv order by src_hour;
Since there could be hundreds or thousands of transactions in any particular hour, you probably order by something other than hour anyway.
In Oracle, the trunc function is the best way to get a date with the time portion stripped away. However, you don't want to use it in the where clause (or, aamof, any other function such as to_date or to_char)as that would make the clause non-sargable and result in a complete table scan.
The problem is that you can't use a sequence in a subquery. For example, this gives the same ORA-02287 error you are getting:
create table T (x number);
create sequence s;
insert into T (select * from (select s.nextval from dual));
What you can do, though, is create a function that returns nextval from the sequence, and use that in a subquery:
create function f return number as
begin
return s.nextval;
end;
/
insert into T (select * from (select f() from dual));
I am very new to Oracle 11g and am trying to generate a large string by appending text for each column in a select statement and using a cursor to store the results. However I want the last statement to not have a union all included. The final result I want to build large string of each row generated or simply execute the result if possible.
Note: column1 has a list of schemas that I am interested in.
select 'select * from ' || column1 || '.' || column2 || ' union all ' from mytable
This is where column1 is the schema, column2 is the table name.
What is the simplest way to generate the final string without using rtrim to remove the last string. And is there a simple way to append all these rows together in the string automatically?
The final goal is to actually just execute the union into a resulting cursor.
If you're querying in a loop anyway I wouldn't try to construct the string as part of the select at all; I'd do it all within the loop. Something like (untested):
declare
str varchar2(32768);
begin
for rec in (select column1, column2, rownum as rn from mytable)
loop
if rec.rn > 1 then
str := str || ' union all ';
end if;
str := str || 'select * from "' || rec.column[ || '"."' || rec.column2 ||'"';
end loop;
-- do something with str e.g. display to verify the syntax
-- before using in a cursor
dbms_output.put_line(str);
end;
Rather than adding union all to the end of every row except the last one,the rn check means it's added to the start of every row except the first one, which is easier to detect.
I've also wrapped the schema and table names in double quotes, just in case you have to deal with any quoted identifiers. But if your stored values don't match the case of the owners and table names in all_tables this will cause a problem rather than solve it.
I am doing an school assigment where I need to get the last value of "code" so I can then insert next row with this code incremented. I tried to pull it out this way.
DECLARE
v_last_code f_shifts.code%TYPE;
BEGIN
SELECT LAST_VALUE(code) OVER (ORDER BY code)
INTO v_last_code
FROM f_shifts;
DBMS_OUTPUT.PUT_LINE('Last value is: ' || v_last_code);
END;
However I get ORA-01422: exact fetch returns more than one requested number of rows
and I have no idea why and how can a last_value be more than one row
Thanks !
You can use a nested table like this.
DECLARE
v_last_code f_shifts.code%TYPE;
TYPE t_tbl IS TABLE OF f_shifts.code%TYPE;
-- Above line creates the nested table type of the required type.
v_tbl T_TBL;
-- Above line creates the nested table variable.
BEGIN
SELECT code
BULK COLLECT INTO v_tbl -- collects all the values, ordered, into the nested table
FROM f_shifts
ORDER BY code;
v_last_code = v_tbl(v_tbl.LAST); -- gets the last values and puts into the variable
DBMS_OUTPUT.PUT_LINE('Last value is: ' || v_last_code);
END;
/
I am having trouble getting a block of pl/sql code to work. In the top of my procedure I get some data from my oracle apex application on what checkboxes are checked. Because the report that contains the checkboxes is generated dynamically I have to loop through the
APEX_APPLICATION.G_F01
list and generate a comma separated string which looks like this
v_list VARCHAR2(255) := (1,3,5,9,10);
I want to then query on that list later and place the v_list on an IN clause like so
SELECT * FROM users
WHERE user_id IN (v_list);
This of course throws an error. My question is what can I convert the v_list to in order to be able to insert it into a IN clause in a query within a pl/sql procedure?
If users is small and user_id doesn't contain commas, you could use:
SELECT * FROM users WHERE ',' || v_list || ',' LIKE '%,'||user_id||',%'
This query is not optimal though because it can't use indexes on user_id.
I advise you to use a pipelined function that returns a table of NUMBER that you can query directly. For example:
CREATE TYPE tab_number IS TABLE OF NUMBER;
/
CREATE OR REPLACE FUNCTION string_to_table_num(p VARCHAR2)
RETURN tab_number
PIPELINED IS
BEGIN
FOR cc IN (SELECT rtrim(regexp_substr(str, '[^,]*,', 1, level), ',') res
FROM (SELECT p || ',' str FROM dual)
CONNECT BY level <= length(str)
- length(replace(str, ',', ''))) LOOP
PIPE ROW(cc.res);
END LOOP;
END;
/
You would then be able to build queries such as:
SELECT *
FROM users
WHERE user_id IN (SELECT *
FROM TABLE(string_to_table_num('1,2,3,4,5'));
You can use XMLTABLE as follows
SELECT * FROM users
WHERE user_id IN (SELECT to_number(column_value) FROM XMLTABLE(v_list));
I have tried to find a solution for that too but never succeeded. You can build the query as a string and then run EXECUTE IMMEDIATE, see http://docs.oracle.com/cd/B19306_01/appdev.102/b14261/dynamic.htm#i14500.
That said, it just occurred to me that the argument of an IN clause can be a sub-select:
SELECT * FROM users
WHERE user_id IN (SELECT something FROM somewhere)
so, is it possible to expose the checkbox values as a stored function? Then you might be able to do something like
SELECT * FROM users
WHERE user_id IN (SELECT my_package.checkbox_func FROM dual)
Personally, i like this approach:
with t as (select 'a,b,c,d,e' str from dual)
--
select val
from t, xmltable('/root/e/text()'
passing xmltype('<root><e>' || replace(t.str,',','</e><e>')|| '</e></root>')
columns val varchar2(10) path '/'
)
Which can be found among other examples in Thread: Split Comma Delimited String Oracle
If you feel like swamping in even more options, visit the OTN plsql forums.
I'm preety new to SQLite.
I have a preety basic question.. Why can't I select rows where specific column equals zero?
The is_unwanted column is type TINYINT (which I see in SQLite basically means INTEGER)
So, I have only one record in the database (for testing).
When I try
SELECT is_unwanted FROM 'urls'
I get a result of "0" (zero), which is fine because that column contains the actual number 0.
I tried =>
SELECT * FROM 'urls' WHERE is_unwanted = 0
And got NO result, but
SELECT * FROM 'urls' WHERE is_unwanted <> 0
gives me result.
What am I doing wrong??
Try running
select '{' || is_unwanted || '}' from urls
to see if the value in the database is really a string containing spaces.
SQLite is a dynamically typed database; when you specify TINYINT is is a hint (SQLite uses the term "affinity") for the column. You can use
select is_unwanted, typeof(is_unwanted) from urls
to see the values with their types.
You could try:
SELECT * FROM urls WHERE coalesce(is_unwanted,'') = ''