Hi I need to search the DML activity of specified list of tables in a schema
single query
select max(ora_rowscn),SCN_TO_TIMESTAMP(max(ora_rowscn)) FROM 'TABLE_NAME'
since it is time consuming and hard to run individual queries ,so i am trying to prepare a dynamic sql to fetch max(ora_rowscn),SCN_TO_TIMESTAMP(max(ora_rowscn)) from all the tables so that i can use a filter and select a set of tables
Query Template
select 'with tmp(table_name, row_number) as (' from dual
union all
select 'select '''||table_name||''',count(*) from '||table_name||' union ' from USER_TABLES
union all
select 'select '''',0 from dual) select table_name,row_number from tmp order by row_number desc ;' from dual;
how do i used the max(ora_rowscn),SCN_TO_TIMESTAMP(max(ora_rowscn)) for all the tables
any suggestions to correct the syntax of the query ?
You can use such a PLSQL code containing EXECUTE IMMEDIATE in order to get the desired values through Dynamic SQL
SET SERVEROUTPUT ON
DECLARE
v_rowscn NUMBER;
v_tmstp TIMESTAMP;
BEGIN
FOR c IN
(SELECT t.table_name FROM user_tables t)
LOOP
BEGIN
EXECUTE IMMEDIATE 'SELECT max(ora_rowscn),SCN_TO_TIMESTAMP(max(ora_rowscn)) FROM '||
c.table_name INTO v_rowscn, v_tmstp;
DBMS_OUTPUT.PUT_LINE( c.table_name||' - max_scn : '|| v_rowscn||
' - max_scn_timestamp : '|| v_tmstp );
EXCEPTION WHEN others THEN DBMS_OUTPUT.PUT_LINE( sqlerrm );
END;
END LOOP;
END;
/
as long as any exception does not occur for each individual table.
Here's my suggestion. I would not recommend using SCN_TO_TIMESTAMP for all tables, since it'll throw ORA-01405 a lot.
select 'with tmp(table_name, max_rscn, ct) as (' from dual
union all
select 'select '''||table_name||''',max(ora_rowscn), count(*) from '||table_name||' union ' from USER_TABLES
union all
select 'select '''',0,0 from dual) select table_name, max_rscn from tmp;' from dual;
Related
I want to select/display the columns of a table that are of a certain format. I wrote the following query:
SELECT
(SELECT
COLUMN_NAME
FROM SYS.ALL_TAB_COLS
WHERE TABLE_NAME='SOME_TABLE' AND DATA_TYPE IN ('DATE'))
FROM SOME_TABLE;
After the query runs for some time, I get the following error:
ORA-01427: single-row subquery returns more than one row
I would want a result that is something like:
DATE1 DATE2
2017-01-01 2017-01-01
2017-01-01 2018-01-02
... ...
Does someone know how to achieve this?
You could make use of a refcursor bind variable and use the PRINT command to display the output from a dynamic query. This works in SQL* Plus and in Toad and SQL developer when run as script.
VARIABLE x refcursor;
DECLARE
v_query CLOB;
BEGIN
SELECT 'SELECT '
|| LISTAGG(column_name, ',')
within GROUP ( ORDER BY column_name )
|| ' FROM '
|| table_name
INTO v_query
FROM sys.all_tab_cols
WHERE table_name = 'EMPLOYEES'
AND data_type IN ( 'DATE' )
GROUP BY table_name;
OPEN :x FOR v_query;
END;
/
PRINT x;
for 12c and above, you could use DBMS_SQL.RETURN_RESULT on a PL/SQL cursor on the same query.
DECLARE
v_query CLOB;
x SYS_REFCURSOR;
BEGIN
SELECT..
..
OPEN x FOR v_query;
DBMS_SQL.RETURN_RESULT(x);
END;
/
Note: If there are multiple tables in different schemas with the same name, you would need to add owner = <schema> as well.
Use this query to return the rows in columns and then you can use and format the columns that dynamically return with execute of EXECUTE IMMEDIATE
SELECT LISTAGG(COLUMN_NAME, ',') WITHIN GROUP(ORDER BY COLUMN_NAME) AS COLUMNA FROM (
SELECT COLUMN_NAME
FROM SYS.ALL_TAB_COLS
WHERE TABLE_NAME = 'SOME_TABLE' AND DATA_TYPE IN ('DATE')
) SOME_TABLE
RESULT:
DATE1, DATE2
I have table like this:
Table-1
Table-2
Table-3
Table-4
Table-5
each table is having many columns and one of the column name is employee_id.
Now, I want to write a query which will
1) return all the tables which is having this columns and
2) results should show the tables if the column is having values or empty values by passing employee_id.
e.g. show table name, column name from Table-1, Table-2,Table-3,... where employee_id='1234'.
If one of the table doesn't have this column, then it is not required to show.
I have verified with link, but it shows only table name and column name and not by passing some column values to it.
Also verified this, but here verifies from entire schema which I dont want to do it.
UPDATE:
Found a solution, but by using xmlsequence which is deprecated,
1)how do I make this code as xmltable?
2) If there are no values in the table, then output should have empty/null. or default as "YES" value
WITH char_cols AS
(SELECT /*+materialize */ table_name, column_name
FROM cols
WHERE data_type IN ('CHAR', 'VARCHAR2') and table_name in ('Table-1','Table-2','Table-3','Table-4','Table-5'))
SELECT DISTINCT SUBSTR (:val, 1, 11) "Employee_ID",
SUBSTR (table_name, 1, 14) "Table",
SUBSTR (column_name, 1, 14) "Column"
FROM char_cols,
TABLE (xmlsequence (dbms_xmlgen.getxmltype ('select "'
|| column_name
|| '" from "'
|| table_name
|| '" where upper("'
|| column_name
|| '") like upper(''%'
|| :val
|| '%'')' ).extract ('ROWSET/ROW/*') ) ) t ORDER BY "Table"
/
This query can be done in one step using the (non-deprecated) XMLTABLE.
Sample Schema
--Table-1 and Table-2 match the criteria.
--Table-3 has the right column but not the right value.
--Table-4 does not have the right column.
create table "Table-1" as select '1234' employee_id from dual;
create table "Table-2" as select '1234' employee_id from dual;
create table "Table-3" as select '4321' employee_id from dual;
create table "Table-4" as select 1 id from dual;
Query
--All tables with the column EMPLOYEE_ID, and the number of rows where EMPLOYEE_ID = '1234'.
select table_name, total
from
(
--Get XML results of dynamic query on relevant tables and columns.
select
dbms_xmlgen.getXMLType(
(
--Create a SELECT statement on each table, UNION ALL'ed together.
select listagg(
'select '''||table_name||''' table_name, count(*) total
from "'||table_name||'" where employee_id = ''1234'''
,' union all'||chr(10)) within group (order by table_name) v_sql
from user_tab_columns
where column_name = 'EMPLOYEE_ID'
)
) xml
from dual
) x
cross join
--Convert the XML data to relational.
xmltable('/ROWSET/ROW'
passing x.xml
columns
table_name varchar2(128) path 'TABLE_NAME',
total number path 'TOTAL'
);
Results
TABLE_NAME TOTAL
---------- -----
Table-1 1
Table-2 1
Table-3 0
Just try to use code below.
Pay your attention that may be nessecery clarify scheme name in loop.
This code works for my local db.
set serveroutput on;
DECLARE
ex_query VARCHAR(300);
num NUMBER;
emp_id number;
BEGIN
emp_id := <put your value>;
FOR rec IN
(SELECT table_name
FROM all_tab_columns
WHERE column_name LIKE upper('employee_id')
)
LOOP
num :=0;
ex_query := 'select count(*) from ' || rec.table_name || ' where employee_id = ' || emp_id;
EXECUTE IMMEDIATE ex_query into num;
if (num>0) then
DBMS_OUTPUT.PUT_LINE(rec.table_name);
end if;
END LOOP;
END;
I tried with the xml thing, but I get an error I cannot solve. Something about a zero size result. How difficult is it to solve this instead of raising exception?! Ask Oracle.
Anyway.
What you can do is use the COLS table to know what table has the employee_id column.
1) what table from table TABLE_LIKE_THIS (I assume column with table names is C) has this column?
select *
from COLS, TABLE_LIKE_THIS t
where cols.table_name = t
and cols.column_name = 'EMPLOYEE_ID'
-- think Oracle metadata/ think upper case
2) Which one has the value you are looking for: write a little chunk of Dynamic PL/SQL with EXECUTE IMMEDIATE to count the tables matching above condition
declare
v_id varchar2(10) := 'JP1829'; -- value you are looking for
v_col varchar2(20) := 'EMPLOYEE_ID'; -- column
n_c number := 0;
begin
for x in (
select table_name
from all_tab_columns cols
, TABLE_LIKE_THIS t
where cols.table_name = t.c
and cols.column_name = v_col
) loop
EXECUTE IMMEDIATE
'select count(1) from '||x.table_name
||' where Nvl('||v_col||', ''##'') = ''' ||v_id||'''' -- adding quotes around string is a little specific
INTO n_c;
if n_c > 0 then
dbms_output.put_line(n_C|| ' in ' ||x.table_name||' has '||v_col||'='||v_id);
end if;
-- idem for null values
-- ... ||' where '||v_col||' is null '
-- or
-- ... ||' where Nvl('||v_col||', ''##'') = ''##'' '
end loop;
dbms_output.put_line('done.');
end;
/
Hope this helps
This question already has answers here:
Can you SELECT everything, but 1 or 2 fields, without writer's cramp?
(12 answers)
Closed 6 years ago.
I want to write a query to fetch data from a table except some columns which start name like given in the wildcard criteria as bellow example pseudo code. Is it possible on oracle?
(this can be done as adding column names for the select clause. but assuming there will be new columns will add in future , i want to write a more generic code)
example
Employee(id , name , age, gender)
select *
from table_name
where column_name not like a%
after query it should display a table with
Employee(id , name . gender)
the age column is not there because we are not include in the result
You can try with some dynamic SQL:
declare
vSQL varchar2(32767);
vClob clob;
begin
/* build the query */
select distinct 'select ' || listagg(column_name, ',') within group (order by column_name) over (partition by table_name)|| ' from ' || table_name
into vSQL
from user_tab_columns
where table_name = 'EMPLOYEE'
and column_name not like 'A%';
/* print the query */
dbms_output.put_line(vSQL);
/* build an XML */
select DBMS_XMLGEN.getXML(vSQL)
into vClob
from dual;
dbms_output.put_line(vClob);
/* build a CLOB with all the columns */
vSQL := replace (vSQL, ',', ' || '' | '' || ' );
execute immediate vSQL into vClob;
dbms_output.put_line(vClob);
end;
In this way you can dynamically build a query that extracts all the columns exept those matching a pattern.
After building the query, the question is how to fetch it, given that you don't know in advance what columns you are fetching.
In the example I make an XML and a single row; you can use the query in different ways, depending on your needs.
Duplicate, but I like writing PL, so here is how you could, creating a temp table, then select * from it:
declare
your_table varchar2(40) := 'CHEMIN';
select_to_tmp varchar2(4000) := 'create table ttmp as select ';
begin
-- drop temporary table if exists
begin
execute immediate 'drop table ttmp';
Exception
When others Then
dbms_output.put_line(SQLERRM);
end;
for x in (
select column_name from all_tab_columns
where table_name=your_table
and column_name not in (
-- list columns you want to exclude
'COL_A'
, 'COL_B'
)
)
loop
select_to_tmp := select_to_tmp|| x.column_name ||',';
dbms_output.put_line(x.column_name);
end loop;
-- remove last ','
select_to_tmp := substr(select_to_tmp, 1, length(select_to_tmp) -1);
-- from your table
select_to_tmp := select_to_tmp||' from '||your_table;
-- add conditions if necessary
-- select_to_tmp := select_to_tmp|| ' where rownum < 1 '
dbms_output.put_line(select_to_tmp);
-- then create the temporary table using the query you generated:
execute immediate select_to_tmp;
end;
/
SELECT * FROM ttmp;
I have a series of history tables in an oracle 9 database. History_table_00 contains last months data, History_table_01 contains the month before, and History_table_02 the month before that. Next month, History_table_02 will automatically get renamed to history_table_03, history_table_01 renamed to history_table_02, history_table_00 renamed to history_table_01, and a new history_table_00 will be created to gather the newest history (I really hope I am making sense).
Anyway, I need to write a select statement that will dynamically select all history tables. I am hoping this won't be too complicated because they all share the same name, just appended with sequential number so I can discover the table names with:
select table_name from all_tables where table_name like 'HISTORY_TABLE_%';
My standard query for each table is going to be:
select id, name, data_column_1, data_column_2 from history_table_%;
What do I have to do to accomplish the goal of writing a sql statement that will always select from all history tables without me needing to go in every month and add the new table? Thanks for anything you guys can provide.
you can use ref cursor but i wouldn't recommend it.
it goes like this
create table tab_01 as select 1 a , 10 b from dual;
create table tab_02 as select 2 a , 20 b from dual;
create table tab_03 as select 3 a , 30 b from dual;
create or replace function get_all_history
return sys_refcursor
as
r sys_refcursor;
stmt varchar2(32000);
cursor c_tables is
select table_name
from user_tables
where table_name like 'TAB_%';
begin
for x in c_tables loop
stmt := stmt || ' select * from ' || x.table_name ||' union all';
end loop;
stmt := substr(stmt , 1 , length(stmt) - length('union all'));
open r for stmt;
return r;
end;
/
SQL> select get_all_history() from dual;
GET_ALL_HISTORY()
--------------------
CURSOR STATEMENT : 1
CURSOR STATEMENT : 1
A B
---------- ----------
1 10
2 20
3 30
I would suggest you to define a view in which you select from all history tables using union all
and each time the tables are renamed you modify the view as well.
create OR replace view history_data as
SELECT id, name, data_column_1, data_column_2 FROM history_table_01
union all
SELECT id, name, data_column_1, data_column_2 FROM history_table_02
union all
SELECT id, name, data_column_1, data_column_2 FROM history_table_03
;
then you can simle SELECT * FROM history_data;
you can build the view dynamicaly with the help of the following statment:
SELECT 'SELECT id, name, data_column_1, data_column_2 FROM ' || table_name || ' union all '
FROM user_tables
WHERE table_name like 'HISTORY_TABLE_%'
The best idea is to do a dynamic SQL statement that builds up a large query for each table existing in the database. Give the following SQL query try. (please forgive my formatting, I am not sure how to do line-breaks on here)
DECLARE #table VARCHAR(255)
, #objectID INT
, #selectQuery VARCHAR(MAX)
SELECT #objectID = MIN(object_id)
FROM sys.tables
WHERE name LIKE 'history_table_%'
WHILE #objectID IS NOT NULL
BEGIN
SELECT #table = name
FROM sys.tables
WHERE object_id = #objectID
ORDER BY object_id
SELECT #selectQuery = ISNULL(#selectQuery + ' UNION ALL ', '') + 'select id, name, data_column_1, data_column_2 FROM ' + #table
SELECT #objectID = MIN(object_id)
FROM sys.tables
WHERE name LIKE 'tblt%'
AND object_id > #objectID
END
SELECT #selectQuery
--EXEC (#selectQuery)
A Possible Solution:
CREATE OR REPLACE PROCEDURE GET_HIST_DETAILS IS
DECLARE
QUERY_STATEMENT VARCHAR2(4000) := NULL;
CNT NUMBER;
BEGIN
select COUNT(table_name) INTO CNT from all_tables where table_name like 'HISTORY_TABLE_%';
FOR loop_counter IN 1..CNT
LOOP
IF LOOP_COUNTER <> CNT THEN
{
QUERY_STATEMENT := QUERY_STATEMENT || 'select id, name, data_column_1, data_column_2 from history_table_0' || loop_counter || ' UNION';
}
ELSE
{
QUERY_STATEMENT := QUERY_STATEMENT || 'select id, name, data_column_1, data_column_2 from history_table_0' || loop_counter ;
}
EXECUTE_IMMEDIATE QUERY_STATEMENT;
END LOOP;
END GET_DETAILS;
PS:I dont have Oracle installed , so havent tested it for syntax errors.
I would love to be able to use the system tables (Oracle in this case) to drive which fields are used in a SELECT statement. Something like:
SELECT
(
select column_name
from all_tab_cols
where table_Name='CLARITY_SER'
AND OWNER='CLARITY'
AND data_type='DATE'
)
FROM CLARITY_SER
This syntax doesn't work, as the subquery returns multiple rows, instead of one row with multiple columns.
Is it possible to generate a SQL statement dynamically by querying the table schema information in order to select only certain columns?
** edit **
Do this without using a function or procedure, if possible.
You can do this:
declare
l_sql varchar2(32767);
rc sys_refcursor;
begin
l_sql := 'select ';
for r in
( select column_name
from all_tab_cols
where table_Name='CLARITY_SER'
AND OWNER='CLARITY'
AND data_type='DATE'
)
loop
l_sql := l_sql || r.column_name || ',';
end loop;
l_sql := rtrim(l_sql,',') || ' from clarity_ser';
open rc for l_sql;
...
end;
No, it's not possible to specify a column list dynamically in SQL. You'll need to use a procedural language to run the first query, use that to construct a second query, then run the second query.
You could use dynamic SQL. Create a function that takes the table name, owner, data type, executes the inner query and returns a comma-separated list of column names, or an array table if you prefer. Then construct the outer query and execute it with execute immediate.
CREATE FUNCTION get_column_list(
table_name IN varchar2,
owner_name IN varchar2,
data_type IN varchar2)
RETURN varchar2
IS
BEGIN
...... (get columns and return comma-separated list)
END;
/
If your function returns a comma-separated list you can inline it:
execute immediate 'select ' || get_column_list(table_name, owner_name, datatype) || ' from ' || table_name
Admittedly it's a long time since I played with oracle so I may be a bit off but I'm pretty sure this is quite doable.
In SQLPlus you could do this:
COLUMN cols NEW_VALUE cols
SELECT max( ltrim( sys_connect_by_path( column_name, ',' ), ',' ) ) cols
FROM
(
select rownum rn, column_name
from all_tab_cols
where table_Name='CLARITY_SER'
and OWNER='CLARITY'
AND data_type='DATE'
)
start with rn = 1 connect by rn = prior rn +1
;
select &cols from clarity.clarity_ser;