I create a table in oracle 12 with a column as identity. The problem is that I want to find the current value of identity column. How I can find this, please someone help me to solve this problem...
You could make use of the data dictionary views *_TAB_IDENTITY_COLS
Here is a working example.
create TABLE t ( ID INTEGER GENERATED BY DEFAULT AS IDENTITY, NAME VARCHAR2(10));
Table created.
INSERT INTO t(NAME) VALUES ( 'TESTER' );
1 row(s) inserted.
select SEQUENCE_NAME FROM user_tab_identity_cols WHERE TABLE_NAME ='T' ;
SEQUENCE_NAME
-----------
ISEQ$$_1727054
Now you could get the currval from this sequence.
select ISEQ$$_1727054.CURRVAL FROM DUAL;
CURRVAL
-------
1
LIVESQL DEMO - Free OTN account required.
Why do you want to know? If to insert a child row you can use the returning clause of the insert statement like this:
insert into master (...) values (...)
returning master_id into l_master_id;
insert into child (master_id, ...) values (l_master_id, ...);
As I've written in this blog post, this query produces all the identities' backing sequences' currval values of your schema:
with
function current_value(p_table_name varchar2) return number is
v_current number;
begin
for rec in (
select data_default
from user_tab_cols
where table_name = p_table_name
and data_default is not null
and identity_column = 'YES'
)
loop
execute immediate replace(
'select ' || rec.data_default || ' from dual',
'.nextval',
'.currval'
) into v_current;
return v_current;
end loop;
return null;
end;
select *
from (
select table_name, current_value(table_name) current_value
from user_tables
)
where current_value is not null
order by table_name;
/
The output could be something like this:
TABLE_NAME CURRENT_VALUE
--------------------------
T1 3
T2 1
Related
I have like thousands tables, each of them will have their own unique key(s) columns. I want to select the keys based on the table name in a single query. Its always the second column in the table if it helps.
I want something like
select c_name from t_name
where c_name (is)
(
select column_name as c_name
from Dba_tab_Columns
where table_name = t_name
and column_name like '%name' --->>>(((or column_id =2)))
)
I know the t_name but I need a single query to select column name based on table_name.
So let say if I say select c_name from Animals, it should give me list of all animals and if I say select c_name from Cars, it should give me a list of avilable cars.
You cannot do this in pure SQL, you'll need a table function. Here's a way:
create or replace type tvc as table of varchar2(128);
/
create or replace function return_col (tname user_tables.table_name%type) return tvc pipelined
as
c_statement varchar2(400);
get_data sys_refcursor;
out_d varchar2(128);
begin
for gettnames_and_cols in (select c.column_name
from user_cons_columns c, user_constraints uc
where constraint_type in ('P','U') and uc.table_name=c.table_name and c.table_name=upper(tname)) loop
c_statement:='select '||gettnames_and_cols.column_name||' as output_col from '||tname;
open get_data for c_statement;
while true loop
fetch get_data into out_d;
exit when get_data%notfound;
pipe row(out_d);
end loop;
close get_data;
end loop;
return;
end;
/
Thing is that this just gives the data, with no idea what's the column_name or from which table the data comes. You can modify the PL/SQL code to add this info. Also, this assumes that the data will be returned as VARCHAR2(128), you may need to adapt this to your needs. You use this table function as follows:
select *
from table (return_col('your_table_name'));
In MYTABLE there are courses and their predecessor courses.
What I am trying to is to find the courses to be taken after the specified course. I am getting missing SELECT keyword error. Why I am getting this error although I have SELECT statement in FOR statement ? Where am I doing wrong ?
DECLARE
coursename varchar2(200) := 'COURSE_101';
str varchar2(200);
BEGIN
WITH DATA AS
(select (select course_name
from MYTABLE
WHERE predecessors like ('''%' || coursename||'%''')
) str
from dual
)
FOR cursor1 IN (SELECT str FROM DATA)
LOOP
DBMS_OUTPUT.PUT_LINE(cursor1);
END LOOP;
end;
Unless I'm wrong, WITH factoring clause can't be used that way; you'll have to use it as an inline view, such as this:
declare
coursename varchar2(200) := 'COURSE_101';
str varchar2(200);
begin
for cursor1 in (select str
from (select (select course_name
from mytable
where predecessors like '''%' || coursename||'%'''
) str
from dual
)
)
loop
dbms_output.put_line(cursor1.str);
end loop;
end;
/
Apart from the fact that it doesn't work (wrong LIKE condition), you OVERcomplicated it. This is how it, actually, does something:
SQL> create table mytable(course_name varchar2(20),
2 predecessors varchar2(20));
Table created.
SQL> insert into mytable values ('COURSE_101', 'COURSE_101');
1 row created.
SQL>
SQL> declare
2 coursename varchar2(20) := 'COURSE_101';
3 begin
4 for cursor1 in (select course_name str
5 from mytable
6 where predecessors like '%' || coursename || '%'
7 )
8 loop
9 dbms_output.put_line(cursor1.str);
10 end loop;
11 end;
12 /
COURSE_101
PL/SQL procedure successfully completed.
SQL>
Also, is that WHERE clause correct? PREDECESSORS LIKE COURSENAME? I'm not saying that it is wrong, just looks somewhat strange.
To extend #Littlefoot's answer a bit: you can use a common table expression (WITH clause) in your cursor, but the WITH must be part of the cursor SELECT statement, not separate from it:
DECLARE
coursename varchar2(200) := 'COURSE_101';
BEGIN
FOR aRow IN (WITH DATA AS (select course_name AS str
from MYTABLE
WHERE predecessors like '''%' || coursename||'%''')
SELECT str FROM DATA)
LOOP
DBMS_OUTPUT.PUT_LINE(aRow.str);
END LOOP;
END;
Also note that the iteration variable in a cursor FOR-loop represents a row returned by the cursor's SELECT statement, so if you want to display whatever was returned by the cursor you must use dotted-variable notation (e.g. aRow.str) to extract fields from the row.
Best of luck.
CREATE TABLE product
(
PRODUCT_ID int Primary key,
NAME VARCHAR (20) not null,
Batchno int not null,
Rate int not null,
Tax int not null,
Expiredate date not null
);
INSERT INTO PRODUCT VALUSES(1 , 'vasocare', 32 , 15 , 2 , 01-JAN-2021);
I have a procedure which receives as parameter a where clause (i.e. where col1 = 1). I am using this clause to search in some tables using an EXECUTE IMMEDIATE statement and the result to be inserted into a nested table, and than be displayed.
The procedure works fine if any data is found but in case no data is found, then the above error is thrown.
Can someone explain what cause this error, please?
Here is the procedure:
create or replace procedure prc_checks(pi_where varchar2) as
cursor c_tables is
select object_name,
case object_name
when 'XP_IMPORT_MW' THEN 99999999
when 'XP_IMPORT_MW_ARCH' THEN 99999998
else TO_NUMBER(SUBSTR(object_name, -8, 8))
end to_order
from dba_objects
where object_type = 'TABLE'
and object_name IN ('XP_IMPORT_MW', 'XP_IMPORT_MW_ARCH')
or REGEXP_LIKE (object_name, 'XP_IMPORT_MW_ARCH_201(5|6|7)[0-9]{4}') order by 2 desc;
type t_result is table of xp_import_mw%rowtype;
v_result t_result;
v_sql varchar2(300);
BEGIN
for i in c_tables
loop
v_sql := 'select * from ' || i.object_name || ' ' || pi_where;
execute immediate v_sql bulk collect into v_result;
if v_result.count > 0
then
for j in v_result.first .. v_result.last
loop
dbms_output.put_line(v_result(j).art_nr);
end loop;
dbms_output.put_line('... the required information was found on table name ' || upper(i.object_name));
exit;
end if;
end loop;
END prc_checks;
You'll get this is one of the tables being found by the cursor has fewer columns than xp_import_mw. For example:
create table xp_import_mw (col1 number, art_nr number, dummy number);
create table xp_import_mw_arch_20160102 (col1 number, art_nr number, dummy number);
create table xp_import_mw_arch_20160101 (col1 number, art_nr number);
insert into xp_import_mw_arch_20160101 values (1, 42);
So the main xp_import_mw table has three columns but no matching data. One of the old archive tables has one fewer columns.
I added a dbms_output.put_line(v_sql) to the procedure to see which table it fails against, then ran it:
set serveroutput on
exec prc_checks('where col1 = 1');
which got output:
select * from XP_IMPORT_MW where col1 = 1
select * from XP_IMPORT_MW_ARCH_20160102 where col1 = 1
select * from XP_IMPORT_MW_ARCH_20160101 where col1 = 1
Error starting at line : 49 in command -
BEGIN prc_checks('where col1 = 1'); END;
Error report -
ORA-01007: variable not in select list
ORA-06512: at "MY_SCHEMA.PRC_CHECKS", line 25
ORA-06512: at line 1
01007. 00000 - "variable not in select list"
*Cause:
*Action:
So the problem isn't that there is no data found; the problem is that there is matching data in a table which has the wrong structure.
You could construct the select list based on the xp_import_mw table's structure, instead of using *; that won't stop it failing, but would at least give you a slightly more helpful error message - in this case ORA-00904: "DUMMY": invalid identifier instead of ORA-01007.
You could do a quick and crude check for discrepancies with something like:
select table_name, count(column_id) as column_count,
listagg(column_name, ',') within group (order by column_id) as columns
from dba_tab_columns
where table_name IN ('XP_IMPORT_MW', 'XP_IMPORT_MW_ARCH')
or REGEXP_LIKE (table_name, 'XP_IMPORT_MW_ARCH_201(5|6|7)[0-9]{4}')
group by table_name
having count(column_id) != (
select count(column_id) from dba_tab_columns where table_name = 'XP_IMPORT_MW'
);
... although if you're using dba_* or all_* view you should really be including the owner, here and in your procedure.
I'm using the below query to get the Max Range of all the Columns of all tables in a Oracle Database
select OWNER,TABLE_NAME,COLUMN_NAME,DATA_PRECISION,(POWER(10,DATA_PRECISION) -1)
from ALL_TAB_COLUMNS where OWNER = 'MASTER' and DATA_TYPE = 'NUMBER' and
DATA_PRECISION is NOT NULL order by TABLE_NAME ASC;
OWNER TABLE_NAME COLUMN_NAME DATA_PRECISION (POWER(10,DATA_PRECISION) -1)
MASTER TABLE_1 COL_1 7 9999999
MASTER TABLE_1 COL_5 7 9999999
MASTER TABLE_2 COL_3 10 9999999999
I am trying to get a 6th & 7th Column, which should be max of that column in that particular table and difference between Max Range( i.e (POWER(10,DATA_PRECISION) -1)) and actual max value in the table.
Ex:
OWNER TABLE_NAME COLUMN_NAME DATA_PRECISION (POWER(10,DATA_PRECISION) -1) MAX_VALUE DIFF
MASTER TABLE_1 COL_1 7 9999999 9994637 5362
MASTER TABLE_1 COL_5 7 9999999 9997637 2362
MASTER TABLE_2 COL_3 10 9999999999 8933999999 1066000000
How to achieve this ?
Would i be able to join tables, using TABLE_NAME ?
Bet, this would be helpful to a lot of people.
The easiest way to go about this is to write a small function that you can provide a table name and column like so:
CREATE OR REPLACE FUNCTION get_max_value (p_table_name VARCHAR2, p_column VARCHAR2)
RETURN NUMBER IS
v_query VARCHAR2(1000);
v_max_value NUMBER;
BEGIN
v_query := 'SELECT MAX (' || p_column ||') FROM '
|| p_table_name ;
EXECUTE IMMEDIATE v_query
INTO v_max_value;
RETURN v_max_value;
END;
And then a slightly modified version of your query above:
SELECT owner,
table_name,
column_name,
data_precision,
(POWER(10,data_precision) -1) ,
get_max_value (owner || '.' || table_name, column_name) max_val
FROM all_tab_columns
WHERE 1 = 1
AND owner = 'MASTER'
AND data_type = 'NUMBER'
AND data_precision is NOT NULL
AND table_name NOT LIKE '%$%'
ORDER BY c.table_name ASC
Just be careful, depending on the number of your tables and the number of rows in each, execution can take a while.
Convert DBA_TAB_COLUMNS.HIGH_VALUE to the maximum value as described in this post by Jonathan Lewis.
The maximum and minimum values are recorded when table statistics are gathered. If the default estimate percent is used, and the statistics were gathered recently, the value will be accurate.
create or replace function raw_to_num(i_raw raw)
return number
as
m_n number;
begin
dbms_stats.convert_raw_value(i_raw,m_n);
return m_n;
end;
/
select owner,table_name,column_name,data_precision
,(power(10,data_precision) -1) max_range
,raw_to_num(high_value) max_value
,(power(10,data_precision) -1) - raw_to_num(high_value) diff
from dba_tab_columns
where data_type = 'NUMBER'
and owner = user
--Add conditions for specific users and tables.
order by owner, table_name, column_name;
I have a table with a few hundred partitions and I am generally interested on the latest 35.
Accordingly I am trying to create views which would access these dynamically. i.e. always use the latest in case ones are created.
The query:
select PARTITION_NAME,
PARTITION_POSITION,
NUM_ROWS,
AVG_ROW_LEN
from all_tab_partitions
where
table_name = 'MY_TABLE'
AND PARTITION_NAME <> 'P_LAST'
AND PARTITION_POSITION < (SELECT MAX(PARTITION_POSITION)
FROM all_tab_partitions) - 35
order by 2 DESC
;
Seems to return me the partition names I'm interested, however, I don't manage to use it's results to select the partitions. e.g.:
CREATE OR REPLACE VIEW MY_VIIEW AS
WITH t AS ( [Above query] )
SELECT * FROM
MY_TABLE PARTITION (SELECT /*+ FIRST_ROWS(1) */ PARTITION_NAME
from t);
(not the actual view, just an example)
So how do I do that? How do I create a view which will acess always the latest partition (execpt of "MAX")?
I am using Oracle 10g
thanks
You can do it using PL/SQL only
create or replace package my_table_ is
type t_records is table of my_table%rowtype;
function getpart(c_parts sys_refcursor) return t_records pipelined;
end;
create or replace package body my_table_ is
function getpart(c_parts sys_refcursor) return t_records pipelined is
v_partition all_tab_partitions.partition_name%type;
v_row my_table%rowtype;
c_mytab sys_refcursor;
begin
loop
fetch c_parts into v_partition;
exit when c_parts%notfound;
open c_mytab for 'select * from my_table partition ('||v_partition||')';
loop
fetch c_mytab into v_row;
exit when c_mytab%notfound;
pipe row (v_row);
end loop;
end loop;
end;
end;
Now you can
select * from table(my_table_.getpart(cursor(<QUERY_RETURNING_PARTITION_NAMES>)));
May be you can construct view's query using batch of union all statements with partition name in each statement, e.g.
create view p as
select * from my_table partition (part1)
union all
select * from my_table partition (part1)
...
union all
select * from my_table partition (part35)
Ok... I don't think your can use the Partition-Names, but you can use the Starting-Values of the Partitions to select the Data matching these Partitions...
So you View would look like this:
SELECT * FROM my_table WHERE date_col > get_part_limit( 'my_table', 35 ):
Where date_col is the column you use for partitioning - and get_part_limit is a stored function you write like this:
...
BEGIN
SELECT high_value FROM all_tab_partitions
INTO local_var
WHERE table_name = parameter_name
AND PARTITION_POSITION = MAX... - 35
EXECUTE IMMEDIATE 'SELECT '||local_var||' FROM DUAL' INTO local_return_value;
RETURN local_return_value;
END;
partitions are designed to be transparent for the data, so when you write a query, you simply don't know how your data is stored.
I see only one possibility to hit a particular partition: your WHERE clause should match values to the partitioned columns of latest (or latest 5) partition.
Next question is to build this WHERE clause on the fly. You already know that there is plenty of information in oracle dictionary. So you will read that and create a constructor to convert metadata conditions back into SQL.
irl we do exactly the same thing and use falco's solution like.
Here is my code:
create or replace function longToDate( myOwner varchar2,
mytable_name in varchar2,
mypartition_name in varchar2
) return date
as
cDate date;
cvar varchar2(1024);
rq varchar2(1024);
infiniteValue EXCEPTION;
PRAGMA EXCEPTION_INIT(infiniteValue, -00904);
begin
select high_value into cvar FROM dba_tab_partitions t where t.table_owner=myOwner and table_name=mytable_name and partition_name=mypartition_name;
rq:='select '||cvar||' from dual';
execute immediate rq into cDate;
return cdate;
EXCEPTION
WHEN infiniteValue
then return'01 jan 3000';
when others
then return null;
end longToDate;
Ant the view is something like this
create or replace view last_35 as
with maxdate as
(select longToDate(p.table_owner,p.table_name,p.partition_name) mydate,
rank()over(order by p.partition_position desc) mypos,
p.* from all_tab_partitions p
where p.table_name='MY_TABLE'
)
select /*+full(a)*/* from MY_TABLE a, maxdate
where MY_TABLE.partition_name>maxdate.mydate
and maxdate.mypos=35