I am not sure if this is possible or not, but here is my problem with select expression in a sql loader file.
I have two tables.
TABLE 1
IDENTITYNUMBER
ID NUMBER
100 8
200 9
TABLE 2
TESTTABLE
NAME ID
John 100
data file for the loader sql
Jim,8
Carol,9
Now, I want to load this data in test table by replacing the second number with the id from the first table.
So this is how my test.ctl file looks like
load data
append
into table testtable
fields terminated by ',' optionally enclosed by '"'
(
NAME,
ID EXPRESSION "(select i.id from identitynumber i where i.number = :ID)"
)
But I keep getting this error:
SQL*Loader-291: Invalid bind variable ID in SQL string for column ID
I expect the table 2 to look like this after a successful execution of the loader script.
TESTTABLE
NAME ID
John 100
Jim 100
Carol 200
Any pointers will be greatly appreciated.
Do without "expression"
ID "(select i.id from identitynumber i where i.number = :ID)"
I don't think select's are allowed in sqlldr EXPRESSION
Functions are:
create function idtestfun(p_num in number) return number
is
l_num number;
begin
select id into l_num from identitynumber where "number"= p_num;
return l_num;
end;
and use it sqlldr config:
ID "idtestfun(:ID)"
Related
I am trying to solve a problem where I have 2 tables in Oracle:
Table 1
id name
101 xyz
102 abc
103 def
Table 2
columnname columndesc
id identifier
name customer name
I want to rename the column name of Table1 with the values present in Table2
Expected output is:
identifier customer name
101 xyz
102 abc
103 def
One option you could try is you should use a Cursor to iterate through each row of Table1 and for each of these rows execute the alter table.
Another option is to also use a cursor to iterate through Table rows and instead build one Alter Table statement, which in turn can be run with EXEC
Useful links:
Alter Table
List item
Execute command
For such dynamic renaming you have to use execute immediate to achieve it,
Here is the sample code using a normal for loop,
begin
for i in (select columnname,columndesc from table2) loop
begin
execute immediate 'alter table table1 rename column '||i.columnname ||' to '||i.columndesc;
exception
when others then
dbms_output.put_line('Renaming failed for column '''|| i.columnname ||''' and columndesc '''||i.columndesc||'''');
continue;
end;
end loop;
end;
/
The code is self explanatory, however I have listed some points to be taken care which are instantly coming to mind.
I hope the the table1's columns you are trying to rename are exactly same as value of columnname in table2
During the rename as you see I have put the statements in begin end and using exception we just skip the one which will fail.
Failure reason could be anything such as,
. the column name you are trying to rename doesn't exists
. the column name value from columndesc exceeds 30/128 char (version < oracle 12.2 and version > oracle 12.2 its 128 characters ) which is the limit in oracle for object names
I have hard coded the table table1 as only talble to rename in this example but again you have got idea now where you can even make the table as dynamic also if you want.
At the end bottom line is to use execute immediate for your primary purpose but you also need to consider all the failure cases as the compilation and execution of the actual statements will happen during run time.
EDIT:
Do not use space in columndesc in table2 as customr name rather use - like customer_name which is standard naming for oracle.
I have procedure like this...
declare
v_psg varchar2(10);
id_no number;
begin
select value into v_psg from settings_am where key = 'PSG';
select id into id_no from product where to_char(psg) in (v_psg);
end;`
The value returned from select value into v_psg from settings_am where key = 'PSG'; would be
'1','2','3'
when i run this procedure i am returned with ora error - ORA-01403.
please advise how i should pass the v_psg value to psg column of product table?
EDIT - Tried with test case suggested
If you got ORA-01403, you were kind of lucky. It is the NO_DATA_FOUND error, which means that one (probably the first) query didn't return anything.
Those two statements could be combined into
select id
from product
where to_char(psg) in (select value
from settings_am
where key = 'PSG'
);
Why would you select value first, and then use it in another query? Besides, it just wouldn't work. v_psg is declared as VARCHAR2 variable. The way you described it, it contains the following string: '1','2','3', as if this is what you have:
SQL> create table settings_am (key varchar2(10),
2 value varchar2(20)); --> note size here
Table created.
SQL> insert into settings_am (key, value)
2 values ('PSG', q'['1','2','3']');
1 row created.
SQL> select * From settings_am;
KEY VALUE
---------- --------------------
PSG '1','2','3'
SQL>
As you can see, I enlarged the value column size, although variable you declared says 10. Why? Because of
SQL> select length(value) from settings_am where key = 'PSG';
LENGTH(VALUE)
-------------
11
i.e. you can't put something that is long 11 into something that accepts length 10.
Or, if your data actually contains 3 rows for the PSG key, are those values already enclosed into single quotes? If so, that's strange; people usually don't do that. Anyway, suppose that you managed to get string '1,2,3' (which is what I presume you actually have) into a VARCHAR2 variable, then you have to split it into rows in order to be able to use it in the IN clause:
SQL> create table product (id number, psg varchar2(10));
Table created.
SQL> insert into product (id, psg) values (100, '1');
1 row created.
SQL> insert into product (id, psg) values (200, '2');
1 row created.
SQL>
Query is then (where lines #3 - 5 represent splitting a string into rows):
SQL> select p.id
2 from product p
3 where p.psg in (select regexp_substr('&&v_psg', '[^,]+', 1, level)
4 from dual
5 connect by level <= regexp_count('&&v_psg', ',') + 1
6 );
Enter value for v_psg: 1,2,3
ID
----------
100
200
So, wouldn't it be simpler to use
SQL> select id
2 from product
3 where to_char(psg) in (select value
4 from settings_am
5 where key = 'PSG'
6 );
ID
----------
100
200
SQL>
Note that both options also show why your query is wrong: you can't put two values (rows) into a variable declared as id_no number; as you'd get TOO_MANY_ROWS error.
Finally, what is it that you'd want to do? What problem are you trying to solve? Apparently, except for special cases (only one row for each value) your query can't work. If you could provide test case (create table & insert into sample data), as well as expected output, it would be easier to help you.
I want to get data from table which name is keeping in another table. Trying to get this as described below leads to getting result from nested SELECT only
select * from (select value from ex_scheme.ex_tab where name = 'ex_name.current_table_name')
I mean, I've got equivalent result as from just
select value from ex_scheme.ex_tab where name = 'ex_name.current_table_name'
query.
UPDATED
Ok, lets double-check if I was correctly understood.
I have to see one table data (lets call this table "table1"). I need to know this table name. And I know where its name is keeping. It is in another table (call it "names_table") in column "name" (row with column value = 'table1'). And I can get it by query
select name from names_table where value = 'table1'
If you know in advance the column and its type, you can build some dynamic SQL to dynamically query a table or another.
For example, say you have tables like the following:
create table table1(col) as (select 1 from dual);
create table table2(col) as (select 2 from dual);
create table tab_of_tabs (tab_name) as (select 'TABLE1' from dual);
You can use dynamic SQL to build a query that scans a table whose name is the result of a query:
SQL> declare
2 vSQL varchar2(1000);
3 vResult number;
4 begin
5 select 'select sum(col) from ' || tab_name -- build the query
6 into vSQL
7 from tab_of_tabs;
8 --
9 execute immediate vSQL into vResult; -- run the query
10 --
11 dbms_output.put_line('Result: ' || vResult);
12 end;
13 /
Result: 1
PL/SQL procedure successfully completed.
SQL>
If I understand correctly, you could use a nested query in a where clause. For example,
select * from table1 where table1.name in (select name from table2);
This assumes there's a column "name" in table1. The result of this query should return the rows in table1 that are in table2.
try giving alias
select n.* from (select value from ex_scheme.ex_tab where name = 'ex_name.current_table_name') n;
Update:
It is in another table (call it "names_table") in column "name" (row
with column value = 'table1').
this query will work
select n.* from (select name from ex_scheme.ex_tab where name = 'ex_name.current_table_name') n;
sub query fetches name of table from another table .
Hi everyone what I'm wondering if I can do is create a table that lists the record counts of other tables. It would get those table names from a table. So let's assume I have the table TABLE_LIST that looks like this
name
---------
sports_products <-- contains 10 records
house_products <-- contains 8 records
beauty_products <-- contains 15 records
I would like to write a statement that pulls the names from those tables to query them and coount the records and ultimately produce this table
name numRecords
------------------------------
sports_products 10
house_products 8
beauty_products 15
So I think I would need to do something like this pseudo code
select *
from foreach tableName in select name from table_list
select count(*) as numRecords
from tableName
loop
You can have a function that is doing this for you via dynamic sql.
However, make sure to declare it as authid current_user. You do not want anyone to gain some sort of privilege elevation by exploiting your function.
create or replace function SampleFunction
(
owner in VarChar
,tableName in VarChar
) return integer authid current_user is
result Integer;
begin
execute immediate 'select count(*) from "' || owner || '"."' || tableName || '"'
INTO result;
return result;
end;
One option is to simply keep your DB statistics updated, use dbms_stats package or EM, and then
select num_rows
from all_tables
where table_name in (select name from table_list);
I think Robert Giesecke solution will work fine.
A more exotic way of solving this is by using dbms_xmlgen.getxml.
See for example: Identify a table with maximum rows in Oracle
I have been getting an intermittent issue when executing to_number function in the where clause on a varchar2 column if number of records exceed a certain number n. I used n as there is no exact number of records on which it happens. On one DB it happens after n was 1 million on another when it was 0.1. million.
E.g. I have a table with 10 million records say Table Country which has field1 varchar2 containing numberic data and Id
If I do a query as an example
select *
from country
where to_number(field1) = 23
and id >1 and id < 100000
This works
But if I do the query
select *
from country
where to_number(field1) = 23
and id >1 and id < 100001
It fails saying invalid number
Next I try the query
select *
from country
where to_number(field1) = 23
and id >2 and id < 100001
It works again
As I only got invalid number it was confusing, but in the log file it said
Memory Notification: Library Cache Object loaded into SGA
Heap size 3823K exceeds notification threshold (2048K)
KGL object name :with sqlplan as (
select c006 object_owner, c007 object_type,c008 object_name
from htmldb_collections
where COLLECTION_NAME='HTMLDB_QUERY_PLAN'
and c007 in ('TABLE','INDEX','MATERIALIZED VIEW','INDEX (UNIQUE)')),
ws_schemas as(
select schema
from wwv_flow_company_schemas
where security_group_id = :flow_security_group_id),
t as(
select s.object_owner table_owner,s.object_name table_name,
d.OBJECT_ID
from sqlplan s,sys.dba_objects d
It seems its related to SGA size, but google did not give me much help on this.
Does anyone have any idea about this issue with TO_NUMBER or oracle functions for large data?
which has field1 varchar2 containing
numberic data
This is not good practice. Numeric data should be kept in NUMBER columns. The reason is simple: if we don't enforce a strong data type we might find ourselves with non-numeric data in our varchar2 column. If that were to happen then a filter like this
where to_number(field1) = 23
would fail with ORA-01722: invalid number.
I can't for certain sure say this is what is happening in your scenario, because I don't understand why apparently insignificant changes in the filters of ID have changed the success of the query. It would be instructive to see the execution plans for the different versions of the queries. But I think it is more likely to be a problem with your data than a bug in the SGA.
Assuming you know that the given range of ids will always result in field1 containing numeric data, you could do this instead:
select *
from (
select /*+NO_MERGE*/ *
from country
where id >1 and id < 100000
)
where to_number(field1) = 23;
Suggest doing the following to determine for sure whether there are records containing non-numeric data. As others have said, variations in the execution plan and order of evaluation could explain why the error does not appear consistently.
(assuming SQLPlus as the client)
SET SERVEROUTPUT ON
DECLARE
x NUMBER;
BEGIN
FOR rec IN (SELECT id, field1 FROM country) LOOP
BEGIN
x := TO_NUMBER( rec.field1 );
EXCEPTION
WHEN OTHERS THEN
dbms_output.put_line( rec.id || ' ' || rec.field1 );
END;
END LOOP;
END;
/
An alternative workaround to your original issue would be to rewrite the query to avoid implicit type conversion, e.g.
SELECT id, TO_NUMBER( field1 )
FROM county
WHERE field1 = '23'
AND <whatever condition on id you want, if any>
Consider writing an IS_NUMBER PL/SQL function:
CREATE OR REPLACE FUNCTION IS_NUMBER (p_input IN VARCHAR2) RETURN NUMBER
AS
BEGIN
RETURN TO_NUMBER (p_input);
EXCEPTION
WHEN OTHERS THEN RETURN NULL;
END IS_NUMBER;
/
SQL> SELECT COUNT(*) FROM DUAL WHERE IS_NUMBER ('TEST') IS NOT NULL;
COUNT(*)
----------
0
SQL> SELECT COUNT(*) FROM DUAL WHERE IS_NUMBER ('123.45') IS NOT NULL;
COUNT(*)
----------
1