I am trying to create a table and wrote following code
create table trial as(
SELECT l2_group AS Customer
, null AS Contact
FROM ACCT_MASKED_sep17_V1) ;
It's giving me an error when I run with create table where as select query runs.
How can I get the result
You need to specify a data type for that NULL column. For example:
create table t1 as
select 1 as c1
, cast(null as number) as c2
from dual
Table created.
If as a datatype for the NULL column you choose VARCHAR2(length) datatype, the length needs to be greater than 0.
Related
There's total of three tables involved. one header base table, one material
base table, one staging table.
I have created the staging table with 4 columns, the values will be
updated from csv uploaded, column 1 is batch_no, column 2 is for
attribute.
>header base table(h) has batch_no and batch_id
>material base table(m) has batch_id, attr_m (empty, to be updated)
>staging table(s) has batch_no and attr_s
create table he (BATCH_ID number, BATCH_NO varchar2(30));
create table me (a6 varchar2(30), BATCH_id number);
create table s (batch_no varchar2(30), att varchar2(30));
I want to take values from attr_s and update attr_m against batch_no. How do I do that?
Here's my code, please help me fix this code, it doesn't work
update me
set a6 = (select att
from s where batch_no = (select he.batch_no
from he, s
where he.batch_no=s.batch_no))
error received:
single row subquery return multiple rows.
single row subquery return multiple rows
The update statement is applied to each individual row in ME. Therefore the assignment operation requires one scalar value to be returned from the subquery. Your subquery is returning multiple values, hence the error.
To fix this you need to further restrict the subquery so it returns one row for each row in ME. From your data model the only way to do this is with the BATCH_ID, like so:
update me
set a6 = (select att
from s where batch_no = (select he.batch_no
from he, s
where he.batch_no=s.batch_no
and he.batch_id = me.batch_id))
Such a solution will work providing that there is only one record in S which matches a given permutation of (batch_no, batch_id). As you have provided any sample data I can't verify that the above statement will actually solve your problem.
Suppose if the table name is ABC_XYZ_123. I want to extract the integer values after _.
The output should be integer values after _.
In the above case, the output should be 123.
I have used the below sql query.
select from table_name like 'XXX_%';
But I am not getting required output. Can anyone help me with this query.
Thanks
Using REGEXP_SUBSTR with a capture group we can try:
SELECT REGEXP_SUBSTR(name, '_(\d+)$', 1, 1, NULL, 1)
FROM yourTable;
The question is somewhat unclear:
it looks as if you're looking for table names that contain number at the end, while
query you posted suggests that you're trying to select those numbers from one of table's columns
I'll stick to
Suppose if the table name is ABC_XYZ_123
If that's so, it is the data dictionary you'll query. USER_TABLES contains that information.
Let's create that table:
SQL> create table abc_xyz_123 (id number);
Table created.
Query selects numbers at the end of table names, for all my tables that end with numbers.
SQL> select table_name,
2 regexp_substr(table_name, '\d+$') result
3 from user_tables
4 where regexp_like(table_name, '\d+$');
TABLE_NAME RESULT
-------------------- ----------
TABLE1 1
TABLE2 2
restore_point-001 001
ABC_XYZ_123 123 --> here's your table
SQL>
Apparently, I have a few of them.
Could you please tell me how to compare differences between table and my select query and insert those results in separate table? My plan is to create one base table (name RESULT) by using select statement and populate it with current result set. Then next day I would like to create procedure which will going to compare same select with RESULT table, and insert differences into another table called DIFFERENCES.
Any ideas?
Thanks!
You can create the RESULT_TABLE using CTAS as follows:
CREATE TABLE RESULT_TABLE
AS SELECT ... -- YOUR QUERY
Then you can use the following procedure which calculates the difference between your query and data from RESULT_TABLE:
CREATE OR REPLACE PROCEDURE FIND_DIFF
AS
BEGIN
INSERT INTO DIFFERENCES
--data present in the query but not in RESULT_TABLE
(SELECT ... -- YOUR QUERY
MINUS
SELECT * FROM RESULT_TABLE)
UNION
--data present in the RESULT_TABLE but not in the query
(SELECT * FROM RESULT_TABLE
MINUS
SELECT ... );-- YOUR QUERY
END;
/
I have used the UNION and the difference between both of them in a different order using MINUS to insert the deleted data also in the DIFFERENCES table. If this is not the requirement then remove the query after/before the UNION according to your requirement.
-- Create a table with results from the query, and ID as primary key
create table result_t as
select id, col_1, col_2, col_3
from <some-query>;
-- Create a table with new rows, deleted rows or updated rows
create table differences_t as
select id
-- Old values
,b.col_1 as old_col_1
,b.col_2 as old_col_2
,b.col_3 as old_col_3
-- New values
,a.col_1 as new_col_1
,a.col_2 as new_col_2
,a.col_3 as new_col_3
-- Execute the query once again
from <some-query> a
-- Outer join to detect also detect new/deleted rows
full join result_t b using(id)
-- Null aware comparison
where decode(a.col_1, b.col_1, 1, 0) = 0
or decode(a.col_2, b.col_2, 1, 0) = 0
or decode(a.col_3, b.col_3, 1, 0) = 0;
I am facing ORA-1772: invalid number again and again when the query is run through pro*c file. Same query works fine when executed directly on pl/sql developer.
SELECT queue_entry_id ,queue_urgency,
TO_CHAR (chg_dt, 'MM-DD-YY'),
TO_CHAR (queue_after_dt, 'MM-DD-YY'),
chg_who ,
upd_cnt FROM BSD_QUEUE_WORK WHERE queue_entry_id IN (
SELECT queue_entry_id FROM (
SELECT /*+ INDEX (bsd_queue_work bsd_q_wrk_dt_idx) */
BSD_QUEUE_WORK.queue_entry_id
FROM BSD_QUEUE_WORK WHERE BSD_QUEUE_WORK.queue_after_dt <= SYSDATE
order by BSD_QUEUE_WORK.queue_urgency DESC, BSD_QUEUE_WORK.queue_after_dt)
WHERE rownum <=20) FOR UPDATE;
Old query looked like -
SELECT
/*+ INDEX (bsd_queue_work bsd_q_wrk_dt_idx) +*/
BSD_QUEUE_WORK.queue_entry_id,
TO_CHAR(BSD_QUEUE_WORK.chg_dt,:b0) ,
TO_CHAR( BSD_QUEUE_WORK.queue_after_dt,:b0) ,
BSD_QUEUE_WORK.chg_who ,
BSD_QUEUE_WORK.upd_cnt
FROM BSD_QUEUE_WORK
WHERE (BSD_QUEUE_WORK.queue_after_dt<=SYSDATE
AND ROWNUM <=:b2)
ORDER BY BSD_QUEUE_WORK.queue_urgency DESC BSD_QUEUE_WORK.queue_after_dt FOR UPDATE
This query was first selecting 20 rows and then sorting them on queue_urgency. This lead to high urgency rows waiting long for their turn if we had total of 10k rows. And, User wanted to find out high queue_urgency rows first and process them in chunks of 20 rows. Hence, I created the new query which is giving errors as above.
Table structure is as-
SQL> desc bsd_queue_work
Name Null? Type
----------------------------------------- -------- ----------------------------
QUEUE_ENTRY_ID NOT NULL NUMBER(18)
QUEUE_AFTER_DT NOT NULL DATE
UPD_CNT NOT NULL NUMBER(6)
CHG_WHO NOT NULL VARCHAR2(32)
CHG_DT NOT NULL DATE
QUEUE_URGENCY NOT NULL NUMBER(38)
I have two Oracle questions.
How can I set the primary key of a table when the table is made up of an object type? e.g.
CREATE TABLE object_names OF object_type
I have created a Varray type,
CREATE TYPE MULTI_TAG AS VARRAY(10) OF VARCHAR(10);
but when I try to do
SELECT p.tags.count FROM pg_photos p;
I get an invalid identifier error on the "count" part. p.tags is a MULTI_TAG, how can I get the number of elements in the MULTI_TAG?
First of all I wouldn't recommend storing data in Object tables. Objects are a great programmatic tool but querying Object tables leads to complicated SQL. I would advise storing your data in a standard relationnal model and using the objects in your procedures.
Now to answer your questions:
A primary key should be immutable, so most of the time an Object type is inappropriate for a primary key. You should define a surrogate key to reference your object.
You will have to convert the varray into a table to be able to query it from SQL
For example:
SQL> CREATE TYPE MULTI_TAG AS VARRAY(10) OF VARCHAR(10);
2 /
Type created
SQL> CREATE TABLE pg_photos (ID number, tags multi_tag);
Table created
SQL> INSERT INTO pg_photos VALUES (1, multi_tag('a','b','c'));
1 row inserted
SQL> INSERT INTO pg_photos VALUES (2, multi_tag('e','f','g'));
1 row inserted
SQL> SELECT p.id, COUNT(*)
2 FROM pg_photos p
3 CROSS JOIN TABLE(p.tags)
4 GROUP BY p.id;
ID COUNT(*)
---------- ----------
1 3
2 3
1)
A primary key is a constraint, to add constrains on object tables check this link:
http://download-west.oracle.com/docs/cd/B28359_01/appdev.111/b28371/adobjdes.htm#i452285
2)
The COUNT method can't be used in a SQL statement:
REF LINK IN COMMENTS
So in my case I had to do
SELECT p.pid AS pid, count(*) AS num_tags FROM pg_photos p, TABLE(p.tags) t2 GROUP BY p.pid;