I have this string : RC1500ZQ10RC2400ZQ20RC23ZQ3RC2322ZQ22
I need to create a procedure or trigger to split the above string and then insert it as a rows to another tables .
Like This :
RC = NEW ROW .
ZQ = NEW COULMN .
Row 1 RC1500ZQ10 = 1500,10
Row 2 RC2400ZQ20 = 2400,20
Row 3 RC23 ZQ3 = 23,3
Row 4 RC2322ZQ22 = 2322,22
and so on ..
Can anyone help on this ?
Any specific reason why you need procedure or Trigger for this?.
Use REGEXP_SUBSTR with CONNECT BY in a single SQL. You may include the query in your procedure to perform insert by passing the string argument.
'RC(.+?)ZQ' - match anything between RC and next ZQ
'ZQ(.+?)(RC|$)' - match anything between ZQ and next RC or line end
SQL Fiddle
Oracle 11g R2 Schema Setup:
create table t as
select 'RC1500ZQ10RC2400ZQ20RC23ZQ3RC2322ZQ22' as s from dual;
Query 1:
--INSERT INTO yourtarget(rc,zq)
SELECT REGEXP_SUBSTR(s, 'RC(.+?)ZQ', 1, LEVEL, NULL, 1) AS RC,
REGEXP_SUBSTR(s, 'ZQ(.+?)(RC|$)', 1, LEVEL, NULL, 1) AS ZQ
FROM t --or DUAL
CONNECT BY LEVEL <= REGEXP_COUNT(s, 'RC(.+?)ZQ')
Results:
| RC | ZQ |
|------|----|
| 1500 | 10 |
| 2400 | 20 |
| 23 | 3 |
| 2322 | 22 |
Related
I have a list of Oracle table and fields and I would like to define for each table, the maximum value of the field of the list.
Input:
+------+--------+
| TAB | FIELDS |
+------+--------+
| tab1 | field1 |
+------+--------+
| tab2 | field2 |
+------+--------+
Output:
+------+--------+-----------+
| TAB | FIELDS | Max value |
+------+--------+-----------+
| tab1 | field1 | 10 |
+------+--------+-----------+
| tab2 | field2 | 15 |
+------+--------+-----------+
I want to write a PL / SQL function to create the loop but I have very little knowledge in this language. Do you have any examples to show me?
The input table is dynamic, which is why I want to use a loop.
thanks in advance
The input is build with system table like all_column_tab The output must be store in a table.
It is indeed not a great design to store and retrieve data, but I presume something like this should work for you. I've used a VARCHAR2 variable for storing max value instead of a Numeric because to handle MAX for non-numeric fields. Your table that stores the max val should be defined as VARCHAR2 for it to work normally for such cases.
DECLARE
v_maxVal VARCHAR2(400);
begin
FOR rec IN
( SELECT table_name,column_name
FROM user_tab_columns where table_name IN ('TAB1','TAB2')
)
LOOP
EXECUTE IMMEDIATE
'SELECT MAX('||rec.column_name||') FROM '||rec.table_name
INTO v_maxVal ;
INSERT INTO fieldstab(tab,fields,max_val) VALUES
( rec.table_name,rec.column_name,v_maxVal);
END LOOP;
END;
/
DEMO
I got an error with the message "ORA-01722: invalid number" when I executed my query. As digged in, I found out, I will get that error when I use a numeric value for a column that expects a varchar.
In my case my query had a case statement like
CASE WHEN CHAR_COLUMN= 1 THEN 'SOME VALUE' END
But the behavior was different in different instances of same oracle version. The same query worked in one of our dev oracle server, but not in the other. I am curious if there is any configuration that allows oracle to use numeric value to be used in a character column.
PS: The oracle version that we are using is Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit Production
I never rely on implicit data type conversion but always make it explicit:
CASE WHEN CHAR_COLUMN = TO_CHAR(1) THEN 'SOME VALUE' END
Or even not convert at all:
CASE WHEN CHAR_COLUMN = '1' THEN 'SOME VALUE' END
The reason is that Oracle tends to convert the character string to a number, not the other way round. See the example from the linked manual page:
Text Literal Example
The text literal '10' has data type CHAR. Oracle implicitly converts it to the NUMBER data type if it appears in a numeric expression as in the following statement:
SELECT salary + '10'
FROM employees;
To reproduce the issue:
create table foo (
CHAR_COLUMN varchar2(10)
);
create table bar (
CHAR_COLUMN varchar2(10)
);
insert into foo (CHAR_COLUMN) values ('1');
insert into foo (CHAR_COLUMN) values ('2');
insert into bar (CHAR_COLUMN) values ('1');
insert into bar (CHAR_COLUMN) values ('yellow');
Then, when querying against numeric 1, the first query table works and the second doesn't:
select * from foo where CHAR_COLUMN = 1;
select * from bar where CHAR_COLUMN = 1;
When you ask Oracle to resolve this comparison:
WHEN CHAR_COLUMN = 1
... Oracle converts the query internally to:
WHEN TO_NUMBER(CHAR_COLUMN) = 1
In my example, this can be spotted in the explain plan:
---------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost | Time |
---------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 7 | 3 | 00:00:01 |
| * 1 | TABLE ACCESS FULL | FOO | 1 | 7 | 3 | 00:00:01 |
---------------------------------------------------------------------
Predicate Information (identified by operation id):
------------------------------------------
* 1 - filter(TO_NUMBER("CHAR_COLUMN")=1)
We need to implement a query rewrite with a bind variable because we don't have the option of modifying the web application source code. Example:
BEGIN
SYS.DBMS_ADVANCED_REWRITE.declare_rewrite_equivalence (
name => 'test_rewrite2',
source_stmt => 'select COUNT(*) from ViewX where columnA = :1',
destination_stmt => 'select COUNT(*) from ViewY where columnA = :1',
validate => FALSE,
rewrite_mode => 'recursive');
END;
The above command will result in error because there is a bind variable:
30353. 00000 - "expression not supported for query rewrite"
*Cause: The SELECT clause referenced UID, USER, ROWNUM, SYSDATE,
CURRENT_TIMESTAMP, MAXVALUE, a sequence number, a bind variable,
correlation variable, a set result, a trigger return variable, a
parallel table queue column, collection iterator, a non-deterministic
date format token RR, etc.
*Action: Remove the offending expression or disable the REWRITE option on
the materialized view.
I am reading here that there is a work around but I just cannot find the document anywhere online.
Could you please tell me what the work around is?
You can't specify the bind parameters, but it should already work as you wish. The key is the recursive parameter you passed as mode.
The recursive and general mode will intercept all statements that involve the table (or view), disregarding the filter, and transform them to target the second table (or view), adapting the filter condition from your original statement.
(If you had defined it as TEXT_MATCH, it would have checked the presence of the same filter in the original and target statement in order to trigger the transformation.)
In the example below one can see that even if we don't define any bind condition, the filter id = 2 is applied nervetheless; in other words it is actually transforming the SELECT * FROM A1 where id = 2 into SELECT * FROM A2 where id = 2
set LINESIZE 300
drop table A1;
drop view A2;
drop index A1_IDX;
EXEC SYS.DBMS_ADVANCED_REWRITE.drop_rewrite_equivalence (name => 'test_rewrite');
create table A1 (id number, name varchar2(20));
insert into A1 values(1, 'hello world');
insert into A1 values(2, 'hola mundo');
create index A1_IDX on A1(id);
select * from A1;
ALTER SESSION SET QUERY_REWRITE_INTEGRITY = TRUSTED;
CREATE OR REPLACE VIEW A2 AS
SELECT id,
INITCAP(name) AS name
FROM A1
ORDER BY id desc;
BEGIN
SYS.DBMS_ADVANCED_REWRITE.declare_rewrite_equivalence (
name => 'test_rewrite',
source_stmt => 'SELECT * FROM A1',
destination_stmt => 'SELECT * FROM A2',
validate => FALSE,
rewrite_mode => 'recursive');
END;
/
select * from A1;
ID NAME
---------- --------------------
2 Hola Mundo
1 Hello World
select * from A1 where id = 2;
ID NAME
---------- --------------------
2 Hola Mundo
explain plan for
select * from A1 where id = 2;
select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
----------------------------------------------------------------------------------------
Plan hash value: 1034670462
----------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
----------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 25 | 2 (0)| 00:00:01 |
| 1 | VIEW | A2 | 1 | 25 | 2 (0)| 00:00:01 |
| 2 | TABLE ACCESS BY INDEX ROWID | A1 | 1 | 25 | 2 (0)| 00:00:01 |
|* 3 | INDEX RANGE SCAN DESCENDING| A1_IDX | 1 | | 1 (0)| 00:00:01 |
----------------------------------------------------------------------------------------
PLAN_TABLE_OUTPUT
---------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
3 - access("ID"=2)
Note
-----
- dynamic sampling used for this statement (level=2)
- automatic DOP: Computed Degree of Parallelism is 1 because of parallel threshold
20 rows selected
As you can see
the engine is transparently applying the transformation and returning the filtered result
on top of that, the transformation on the filter is applied. The filter is correctly "pushed" into the source table, to extract the values from A1. It is not blindly extracting all values from A2 and then applying the filter, so the performance is preserved.
I am using a stored procedure which returns a dataset. My procedure is like this
ALTER procedure [dbo].[USP_DisplaySaldetails]
as begin
DECLARE #cols AS NVARCHAR(MAX),
#query AS NVARCHAR(MAX)
select #cols = STUFF((SELECT ',' + QUOTENAME(SST_Name)
from CM_SalType where SST_isdeleted='false'
group by SST_id, SST_Name
order by SST_id
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set #query = 'SELECT U_id, ' + #cols + '
from
(
select t.SST_Name,
s.U_id,u.U_Fname,u.U_lname,
s.SSV_Value
from CM_SalType t
left join CM_StaffSal s
on t.SST_id = s.SST_id inner join CM_User u on u.U_id=s.U_id
) x
pivot
( max(SSV_Value)
for SST_Name in (' + #cols + ')
) p '
execute(#query)
end
the result set is
| U_ID | BASIC | HRA | DA |
------------------------------
| 11 | 15000 | 0.1 | 0.75 |
| 12 | 10000 | 0.01 | 0.5 |
here the column names are dynamic.so how to call this procedure from mvc3 and how will i get the dataset into my controller. No parameters are passing to the stored procedure
Details of my table structure is in Assign value of a column in a table as columname of another table. I am using entity framework
I tried to create PL/SQL script that would update my table with column size.
My table looks like this:
| ID | TEXT | SIZE |
--------------------
| 1 | .... | null |
| 2 | .... | null |
| 3 | .... | null |
...
I want the PL/SQL script to fill the size column depending of the length of text for a certain document and then delete the contents of the TEXT column.
Here's what I've tried:
DECLARE
cursor s1 is select id from table where size is null;
BEGIN for d1 in s1 loop
update table set size = (select length(TEXT) from table where id = d1) where id=d1;
end loop;
END;
/
Unless there is a good reason, do this in pure SQL (or put the following statement into PL/SQL):
UPDATE t
SET size = LENGTH(text),
text = NULL
WHERE size IS NULL;
This is both easier to read and faster.