To find no of columns in a table
Hi
Please let me know how could i find number of columns in a table,ie how many fields the table has.
Thank you
Mary
Let us have a guess. "Interview question" i.e. "How do you [insert standard, common task here] without using [insert standard solution here]"
..is there any other way to find without using user_tab_columns. Use the ALL_tab_columns view
Similar Messages
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How to Find Two Matching Columns in Two Table(to create a JOIN)
Hi Guys!
I just wondering if it is possible to have a SQL query to find two matches columns in two table to create any type of joins?!
Let's say I have two tables CUSTOMER + INVOICE is it possible to run a SQL query to find two join able columns without scanning the tables visually?!
Best Regards,Well, there's the Data Dictionary you could query for foreign key columns/constraints.
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:661009003696 -
How can I find number of columns in a table using a query
Hi
I want to find the number of columns in a table using a query.
Any help in this regard is much appreciated.
CheersHi,
This is the output i get when i executed ur query
OWNER OBJECT_NAME OBJECT_TYPE
SMLDBO T2311_SURVEY_QUESTIONS TABLE
select OWNER,OBJECT_NAME,OBJECT_TYPE
from all_objects
where OBJECT_NAME = 'T2311_SURVEY_QUESTIONS';
works Fine.
But if i use the below query it returns : 0
SELECT count(*) FROM user_tab_columns
WHERE table_name =upper( 'T2311_SURVEY_QUESTIONS');
What could be problem.
The table exists + name of the table is correct + it resides in my schema itself.
Any guess !!! -
How to find diffrence in columns from two tables
Hello,
I have table TABLE1 and TABLE2 with same columns. One of the columns in both tables is ID
Now there are records in table TABLE1 with ID=1
and in table TABLE 2 with ID=-1
Now I want to find if there are any column differing in values in tables TABLE1 for ID=1(for TABLE1) and TABLE2 for ID = -1 (for TABLE2)
What is the best way to find the diffrence?
Thanks in advance.Hello Subhash,
Why don't you try NOT EXISTS functionality? Its quite performance effective too.
select * from table1
where NOT EXISTS
(select 1 from table 2
where table1.ID = table2.ID)
UNION
select * from table2
where NOT EXISTS
(select 1 from table 2
where table1.ID = table2.ID)You can go for UNION if required, or else you can use them separately. -
hi
i wnat find the number of columns in a table.
is there any predefine fiunction. pls tell meThanks for correction!
I asked myself that question after posting previous post... started to search in Documentation but you were faster.
Thanks again!
Message was edited by:
Faust
Edit:
Dear thread users!
You have here (in my post in this thread - see above) good example for inappropriate post in one thread.
I posted to fast - I didn't realise am I sure what I wrote!
Consequence was that, after posting, I asked myself is it correct my statement about rights on SYS-objects, I started to search for answer, etc.
So what I want to say is: if you don't want to find yourself foolish, like I found myself, don't post before you are sure is it correct what you wrote!
Cheers! -
How to find out the NULL columns in the table?
Hi,
Please provide the query to find the null columns in the table. Here, all rows in the table have same column as null. It won't change.
Table
c1 c2 c3 c4
X C 10
T D 20
I wanna find out as C2 is the nullable column.
Thanks in advance !!
Regards,
Vissu....Below code might be solution for finding NULL valued in columns in a table and if it is solution .kindly give me points for the same.
declare
cursor col_cur is
select column_name
from user_tab_cols -- all_tables can also be used in case the table is present in own schema
where table_name = 'TABLE_NAME'; --provide the TABLE_NAME
stmt varchar2(1000):= '';
v_count number;
count_null number;
begin
execute immediate 'select count(*) from TABLE_NAME' into v_count; --provide the TABLE_NAME
for rec in col_cur loop
execute immediate 'select count(*) from TABLE_NAME' where --provide the TABLE_NAME
'||rec.column_name||' IS NULL' into count_null;
if count_null = v_count then
stmt :=stmt|| rec.column_name ||chr(13);
end if;
end loop;
dbms_output.put_line(stmt);
end ; -
How to get the column name and table name with value
Hi All
I have one difficult requirement
I have some column values and they have given some alias column names but i need to find the correct column name and table name from the database.
For example value is "SRI" and i dont know the table and exact column name so is there any possibilities to find the column name and table name for the given value
Thanks & Regards
Srikkanth.MSearching all the database for a word...
Courtesy of michaels...
michaels> var val varchar2(5)
michaels> exec :val := 'as'
PL/SQL procedure successfully completed.
michaels> select distinct substr (:val, 1, 11) "Searchword",
substr (table_name, 1, 14) "Table",
substr (t.column_value.getstringval (), 1, 50) "Column/Value"
from cols,
table
(xmlsequence
(dbms_xmlgen.getxmltype ('select ' || column_name
|| ' from ' || table_name
|| ' where upper('
|| column_name
|| ') like upper(''%' || :val
|| '%'')'
).extract ('ROWSET/ROW/*')
) t
-- where table_name in ('EMPLOYEES', 'JOB_HISTORY', 'DEPARTMENTS')
order by "Table"or
11g upwards
SQL> select table_name,
column_name,
:search_string search_string,
result
from (select column_name,
table_name,
'ora:view("' || table_name || '")/ROW/' || column_name || '[ora:contains(text(),"%' || :search_string || '%") > 0]' str
from cols
where table_name in ('EMP', 'DEPT')),
xmltable (str columns result varchar2(10) path '.')
TABLE_NAME COLUMN_NAME SEARCH_STRING RESULT
DEPT DNAME es RESEARCH
EMP ENAME es JAMES
EMP JOB es SALESMAN
EMP JOB es SALESMAN
4 rows selected. -
How do i find out what is the data type of a column of a Table in oracle or SQL?
a) What if i want to find out the Datatype of a specific column in the Table.
b) How do i find the Column Datatypes?
Can anyone please help me. I am new to oracle and Trying to Learn some stuffHi,
How about doing
SQL> desc <table_name>
SQL> desc emp
Name Null? Type
EMPNO NOT NULL NUMBER(4)
ENAME VARCHAR2(10)
JOB VARCHAR2(9)
MGR NUMBER(4)
HIREDATE DATE
SAL NUMBER(7,2)
COMM NUMBER(7,2)
DEPTNO NUMBER(2) -
How to find the frequently updated columns in a table
Hi ,
I need to find out all the columns of a tables which are frequently getting updated.
is there any way that I can achieve this ? I am not sure if any meta data information for DML operations exist in Oracle 9 i. Any input is welcome.
Thanks in Advance !!Thank u , i am thinking the same, Thanks for the suggestion.
any other idea.... like is there any system table which we can query to get details about these dml operations on a table ?are there any kind of system audit tables in oracle where these get recorded ? -
How to find columns in a table ?
Hi
I want a sql query to find a columns in specfic table
all i hav in hand is the name of the table and a value which i know is in the columns but dont know which column
for example i know there is table named student with 15 columns and a value of a column is 'ABC' but i dont have the name of the column
how to find the table using SQL query
Thanks in Advance
BalaSELECT column_name,
table_name
FROM user_tab_cols
WHERE table_name IN ('<yourtablenamehere>')
AND extractvalue(dbms_xmlgen.getxmltype('select ''Found'' col from '|| table_name ||' where rownum=1 and ' || CASE WHEN data_type IN
( SELECT DISTINCT data_type FROM user_tab_cols WHERE data_type NOT LIKE 'TIME%' AND data_type != 'DATE' )
THEN column_name ELSE 'to_char('||column_name||',''DD-MM-YYYY HH24:MI:ss'')' END
||' = ''<yourcolumnvaluetobefound>'' '),'//COL')='Found';Fill <yourtablenamehere> and <yourcolumnvaluetobefound> in the above query and get the result.
Ravi Kumar -
How to find the column name and table name with a value
Hi All
How to find the column name and table name with "Value".
For Example i have value named "Srikkanth" This value will be stored in one table and in one column i we dont know the table how to find the table name and column name
Any help is highly appricatable
Thanks & Regards
Srikkanth.M2 solutions by Michaels (the latter is 11g upwards only)...
michaels> var val varchar2(5)
michaels> exec :val := 'as'
PL/SQL procedure successfully completed.
michaels> select distinct substr (:val, 1, 11) "Searchword",
substr (table_name, 1, 14) "Table",
substr (t.column_value.getstringval (), 1, 50) "Column/Value"
from cols,
table
(xmlsequence
(dbms_xmlgen.getxmltype ('select ' || column_name
|| ' from ' || table_name
|| ' where upper('
|| column_name
|| ') like upper(''%' || :val
|| '%'')'
).extract ('ROWSET/ROW/*')
) t
-- where table_name in ('EMPLOYEES', 'JOB_HISTORY', 'DEPARTMENTS')
order by "Table"or
SQL> select table_name,
column_name,
:search_string search_string,
result
from cols,
xmltable(('ora:view("'||table_name||'")/ROW/'||column_name||'[ora:contains(text(),"%'|| :search_string || '%") > 0]')
columns result varchar2(10) path '.'
where table_name in ('EMP', 'DEPT')
TABLE_NAME COLUMN_NAME SEARCH_STRING RESULT
DEPT DNAME ES RESEARCH
DEPT DNAME ES SALES
EMP ENAME ES JONES
EMP ENAME ES JAMES
EMP JOB ES SALESMAN
EMP JOB ES SALESMAN
EMP JOB ES SALESMAN
EMP JOB ES PRESIDENT
EMP JOB ES SALESMAN
9 rows selected. -
How to find the creation date of a column in a table?
Hi,
i scroll all the view and table of the Oracle RDBMS catalog and i didn't find how i can find when a column has been added to a table.
Is there a way i can find this info?
The column added is not the same date tehn the date of the table creation or the analyse column.
ThanksHi,
Something like this
select table_name, created from user_objects where object_type = 'TABLE'Regards
Anurag Tibrewal
Oops: I did not see the requirement correctly. If auditing is not the option for you then logminer (if archive is present) else no other option i can think of.
Edited by: Anurag Tibrewal on Oct 6, 2009 8:37 PM -
Query to find the no of columns in a table
Is there a query to find the total number of columns in a table?
Dou you know read?
-- the number of rows in a table named yourtable:
select count(1) from yourtable;
-- the number of columns in a table
-- If is a user's table:
select count(1)
from user_tab_columns
where table_name='YOURTABLE'
--If it is´t
select count(1)
from DBA_tab_columns
where owner = 'USEROWNER'
and table_name='YOURTABLE' -
DBMS_CDC find only the columns that are changed along with the primary key in the table
Hello,
We are having a requirement to find the change data in the production environment.
We are planning to use the DBMS_CDC utility.
But for example in the create change table 1 picked emp_id,ename, address, salary,dob.
I have a sample data of
empid
ename
address
salary
DOB
1
test1
24 test street
2000
20-Jan-98
2
test2
25 test street
2500
15-Aug-97
if ename for empid 1 is changed to test1_test3 from test1.
My CDC is capturing the values in the old and new values in the 5 columns.
But i need to get only the empid (primary key of the source table) and the ename column as only that's been updated not the rest of the 3 columns.
Can i accomplish this.
Please advice.Hello,
Thanks for the information.
but if i change the change table then i will miss the other columns right?
I want to get the columns( empid and ename) only if ename is changed. i.e when ever any column in emp table changes i need to get all the columns where the data is changed along with the primary key columns empid.
Is there any way i can tweak the parameters so that i can achieve this or is there any other way using the cdc i can get this data.
Thanks -
How to find the partition column in a partitioned table
Hi,
I have a partition table and I need to find out what column was used to partition the table. Range partition.
Thanks,
Maria Sanchezselect *
from dba_part_key_columns
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