Query to count of Columns??

How to count the number of columns of a table??
Thanks in Advance,
Babjan.

Ora wrote:
select count(1) from user_tab_cols where table_name = 'TEMP'
There is a slight difference between user_tab_cols and user_tab_columns. And user_tab_cols is not suitable for counting table columns:
SQL> create table tbl(n number)
2 /
Table created.
SQL> select count(*)
2 from all_tab_cols
3 where owner = 'SCOTT'
4 and table_name = 'TBL'
5 /
COUNT(*)
         1
SQL> select count(*)
2 from all_tab_columns
3 where owner = 'SCOTT'
4 and table_name = 'TBL'
5 /
COUNT(*)
         1
SQL> create index tbl_fbi1
2 on tbl(nvl(n,0))
3 /
Index created.
SQL> select count(*)
2 from all_tab_cols
3 where owner = 'SCOTT'
4 and table_name = 'TBL'
5 /
COUNT(*)
         2
SQL> select count(*)
2 from all_tab_columns
3 where owner = 'SCOTT'
4 and table_name = 'TBL'
5 /
COUNT(*)
         1
SQL> SY.

Similar Messages

Count of columns in a query

All,
Could anyone please clarify me on , how we can count the column's which were used in a query.
Ex:    SELECT ENAME, EMPNO, SAL , JOB FROM EMP;
--Here in the above query, I have taken 4 columns(counted manually) . Instead of counting it manually is there any other way.
Thanks

It sounds like you're creating dynamic SQL. Why are you doing that? Dynamic SQL's would seem to indicate you don't know the structure of your own database or that your application design is trying to be generic rather than being designed in proper modularized units (1 unit does 1 task, not multiple generic tasks). 99.999% of the time, people using dynamic SQL indicates that they are misusing the database or haven't designed things properly.
If there's really a valid reason for using dynamic SQL, then of course you can do it properly and use all the features of Oracle to get information about the dynamic SQL, but that means not using something as poor as EXECUTE IMMEDIATE (which is often abused by most people), or trying to use ref cursors within PL/SQL (which are more intended for 3rd party application layers). The power of dynamic SQL is gained from using the DBMS_SQL package... as in the following simplistic example...
SQL> set serverout on
SQL> create or replace procedure run_query(p_sql IN VARCHAR2) is
2    v_v_val     varchar2(4000);
3    v_n_val     number;
4    v_d_val     date;
5    v_ret       number;
6    c           number;
7    d           number;
8    col_cnt     integer;
9    f           boolean;
10    rec_tab     dbms_sql.desc_tab;
11    col_num     number;
12    v_rowcount number := 0;
13 begin
14    -- create a cursor
15    c := dbms_sql.open_cursor;
16    -- parse the SQL statement into the cursor
17    dbms_sql.parse(c, p_sql, dbms_sql.native);
18    -- execute the cursor
19    d := dbms_sql.execute(c);
20    --
21    -- Describe the columns returned by the SQL statement
22    dbms_sql.describe_columns(c, col_cnt, rec_tab);
23    --
24    -- Bind local return variables to the various columns based on their types
25
26    dbms_output.put_line('Number of columns in query : '||col_cnt);
27    for j in 1..col_cnt
28    loop
29      case rec_tab(j).col_type
30        when 1 then dbms_sql.define_column(c,j,v_v_val,2000); -- Varchar2
31        when 2 then dbms_sql.define_column(c,j,v_n_val);      -- Number
32        when 12 then dbms_sql.define_column(c,j,v_d_val);     -- Date
33      else
34        dbms_sql.define_column(c,j,v_v_val,2000); -- Any other type return as varchar2
35      end case;
36    end loop;
37    --
38    -- Display what columns are being returned...
39    dbms_output.put_line('-- Columns --');
40    for j in 1..col_cnt
41    loop
42      dbms_output.put_line(rec_tab(j).col_name||' - '||case rec_tab(j).col_type when 1 then 'VARCHAR2'
43                                                                                when 2 then 'NUMBER'
44                                                                                when 12 then 'DATE'
45                                                       else 'Other' end);
46    end loop;
47    dbms_output.put_line('-------------');
48    --
49    -- This part outputs the DATA
50    loop
51      -- Fetch a row of data through the cursor
52      v_ret := dbms_sql.fetch_rows(c);
53      -- Exit when no more rows
54      exit when v_ret = 0;
55      v_rowcount := v_rowcount + 1;
56      dbms_output.put_line('Row: '||v_rowcount);
57      dbms_output.put_line('--------------');
58      -- Fetch the value of each column from the row
59      for j in 1..col_cnt
60      loop
61        -- Fetch each column into the correct data type based on the description of the column
62        case rec_tab(j).col_type
63          when 1 then dbms_sql.column_value(c,j,v_v_val);
64                       dbms_output.put_line(rec_tab(j).col_name||' : '||v_v_val);
65          when 2 then dbms_sql.column_value(c,j,v_n_val);
66                       dbms_output.put_line(rec_tab(j).col_name||' : '||v_n_val);
67          when 12 then dbms_sql.column_value(c,j,v_d_val);
68                       dbms_output.put_line(rec_tab(j).col_name||' : '||to_char(v_d_val,'DD/MM/YYYY HH24:MI:SS'));
69        else
70          dbms_sql.column_value(c,j,v_v_val);
71          dbms_output.put_line(rec_tab(j).col_name||' : '||v_v_val);
72        end case;
73      end loop;
74      dbms_output.put_line('--------------');
75    end loop;
76    --
77    -- Close the cursor now we have finished with it
78    dbms_sql.close_cursor(c);
79 END;
80 /
Procedure created.
SQL> exec run_query('select empno, ename, deptno, sal from emp where deptno = 10');
Number of columns in query : 4
-- Columns --
EMPNO - NUMBER
ENAME - VARCHAR2
DEPTNO - NUMBER
SAL - NUMBER
Row: 1
EMPNO : 7782
ENAME : CLARK
DEPTNO : 10
SAL : 2450
Row: 2
EMPNO : 7839
ENAME : KING
DEPTNO : 10
SAL : 5000
Row: 3
EMPNO : 7934
ENAME : MILLER
DEPTNO : 10
SAL : 1300
PL/SQL procedure successfully completed.
SQL>

How can i get a query to count a number of strings?

I want the query to count for me how many holidays there are to the USA in my table. But im not sure how to get it to retreive the result of a string or varchar2 datatype. This is what i have tried so far.
select count(COUNTRYVIS) <<this column contains all the countries visited
from "IT220_HOLIDAYDETAILS" <<this is the table where the column is
where COUNTRYVIS = "USA" << this is the result i want it to count
ORA-00904: "USA": invalid identifier <<this is the error message im getting, is there a way to count strings?
Thanks in advance!

This has nothing to do with APEX. Please post basic SQL questions on the +{forum:id=75}+ forum.
In any OTN forum, alll code should be posted wrapped in <tt>\...\</tt> tags as described in the FAQ:
select count(COUNTRYVIS) -- this column contains all the countries visited
from "IT220_HOLIDAYDETAILS" -- this is the table where the column is
where COUNTRYVIS = "USA" -- this is the result i want it to countYou appear to be struggling with the distinction between identifiers and text literals. Hint: One uses double quotes, the other single quotes.
Note that quoted identifiers are generally not a good idea.

Need query to compare the columns of 2 diff tables of 2 different schemas.

There are two different tables(sample1, sample2) in different schemas(s_schema1, s_schema2).
I want the query to compare the columns of two different tables of two different schemas and provide whether the data as well as the count of data in
the column are same .
if not provide the data which is not similar in the columns of two different table.
NOTE:
I need queries for both the cases.
(i) The datatypes in columns of two different tables are same.
(ii) The datatypes in columns of two different tables are diffrent.

Welcome to the forum!
Whenever you post provide your 4 digit Oracle version.
>
I need queries for both the cases.
>
Great - write the queries!
The forum is not a coding service where you ask people to write code for you for free.
YOU need to write the code. Then if you have a problem with the code you have written post the code you have written (using \ tags) and explain the problem you are having.
Read the FAQ about how to ask a question on the forums.

Count(*) returns 'Column 'Count' not found' SQLException

I am trying to get the count from a table using the following:
String query = "SELECT COUNT(*) FROM myTable;"
I know that the connection is open and working because I am getting back an SQLException:
'Column 'Count' not found' .
The same command works fine at the command line. I would be grateful for any suggestions as to why JDBC sends my app searching for a field named count in my table whereas the command line returns the expected number.
Thanks.

Found the problem, which is mainly my own stupidity . Is it one of Murphy's laws that the quickest way to find the solution to a problem if first embarrass yourself by asking foolish questions? Sorry to have bothered anyone.

Query to add a column in between existing cols of a table?

HI All,
I have two questions.
1. Query to add a column in between existing cols of a table? (not at the end. This is view of an order of output fields in a report)
2. How do I swap the contents of two columns in a table. Suppose in a table tab there are 2 cols , col1,col2 populated with some data.
I need a query(probably) to swap the col1 and col2 values . NOT AS A RESULT SET, BUT IT NEEDS TO GET CHANGED IN THE TABLE.
Please help !

> 1. Query to add a column in between existing cols of
a table? (not at the end. This is view of an order of
output fields in a report)
Not really sensible ito DBMS - it does not care how you want to view the data. The sequence and formats of columns are what you/the application need to specify in the SQL's projection clause.
Also keep in mind to achieve this, the DBMS will need to rewrite the entire table to fit this new column in-between existing columns. This is not the best of ideas.
The projection of rows is dealt with SQL statements - not with the physical storage implementation.
> 2. How do I swap the contents of two columns in a
table. Suppose in a table tab there are 2 cols ,
col1,col2 populated with some data.
I need a query(probably) to swap the col1 and col2
values . NOT AS A RESULT SET, BUT IT NEEDS TO GET
CHANGED IN THE TABLE.
This seems to work:
SQL> create table foo_tab( c1 varchar2(10), c2 varchar2(10) );
Table created.
SQL> insert into foo_tab select TO_CHAR(rownum), TO_CHAR(object_id) from user_objects where rownum < 11;
10 rows created.
SQL> commit;
Commit complete.
SQL> select * from foo_tab;
C1 C2
1 55816
2 55817
3 55818
4 55721
5 105357
6 105358
7 105359
8 105360
9 105361
10 60222
10 rows selected.
SQL> update foo_tab set c1=c2, c2=c1;
10 rows updated.
SQL> select * from foo_tab;
C1 C2
55816 1
55817 2
55818 3
55721 4
105357 5
105358 6
105359 7
105360 8
105361 9
60222 10
10 rows selected.
SQL>

SQL Query - The number of columns specified in "SQL Query" does not match t

I am creating new UDM for tablespace alert, below is my query,however its failing with error
SQL Query - The number of columns specified in "SQL Query" does not match the value specified in "SQL Query Output"
I selected Metric type is number
SQL Query Format : Two columns
Query:
SELECT d.tablespace_name,round(((a.bytes - NVL(f.bytes,0))*100/a.maxbytes),2)
used_pct FROM sys.dba_tablespaces d,(select tablespace_name, sum(bytes) bytes, sum(greatest(maxbytes,bytes)) maxbytes from sys.dba_data_files group by tablespace_name) a,(select tablespace_name, sum(bytes) bytes from sys.dba_free_space group by tablespace_name) f
WHERE d.tablespace_name = a.tablespace_name(+) AND d.tablespace_name = f.tablespace_name(+)
AND NOT (d.extent_management = 'LOCAL' AND d.contents = 'TEMPORARY');
Any clues why i am getting error.

SQL> SELECT d.tablespace_name,round(((a.bytes - NVL(f.bytes,0))*100/a.maxbytes),2) used_pct
2 FROM sys.dba_tablespaces d,(select tablespace_name, sum(bytes) bytes, sum(greatest(maxbytes,bytes)) maxbytes from sys.dba_data_files group by tablespace_name) a,(select tablespace_name, sum(bytes) bytes from sys.dba_free_space group by tablespace_name) f
3 WHERE d.tablespace_name = a.tablespace_name(+) AND d.tablespace_name = f.tablespace_name(+)
4 AND NOT (d.extent_management = 'LOCAL' AND d.contents = 'TEMPORARY');
TABLESPACE_NAME USED_PCT
MGMT_TABLESPACE .82
SYSAUX 1.52
UNDOTBS1 .32
RMAN .02
CORRUPT_TS 10.63
USERS 0
SYSTEM 2.26
MGMT_ECM_DEPOT_TS .04
MGMT_AD4J_TS 0

IF NEW VARIABLE IN SQL QUERY, DISPLAYS AS LAST COLUMN + rpad not working

Hello everybody and thank you in advance,
1) if I add a new variable to my sql query to select a column which was already in the table, it shows it in the report table as the Last column to the right. That is, if I add "street" to
something like city, postcode, street, store, manager, etc, instead of placing street between postcode and store, it places it as i said as the last column to the right.
2) When values are entered into the cells of the tables, yes, they do expand it to their needed lenght, But, only if it is one word. If it is two, like when i enter the value "very good"
then it takes two lines so as with a carriage return within the cell, thus, making it too high the row. I tried to padd spaces with rpad but it did not work. something like rpad(stock, 20,' ')
I must say that the table is in the same page where there is a Form, so as the table grows in lenth it is actually squeezing the form located right on its left.
3) rpad did not work with the most simple syntax, but less would with what i need because it turns out i am using DECODE in order to do a conversion between value displayed and
value returned in my select list of values, something like : DECODE (TO_CHAR (stock),'1','Deficient','2','Average','3','Good','4','Very Good',null) AS stock,
so, i have tried to put the rpad there in several places but either it gave parsing error or it left the column empty not picking any values.
thank you very much
Alvaro

Alvaro
1) That is standard behaviour of apex builder. You can change the display order with the arrows in the report attributes column report.
2) You will have to play with the style attributes of the column to accomplice this. For instance style="white-space:pre;" in the Element Attributes of the column attributes. White-space:normal would thread several space (' ') as 1. So no matter how many you add with rpad they will be shown as 1.
Or set a width either as attibute or in a style class for that column.
Nicolette

General Query to identify parent columns and child columns in a table

Does anyone know a general query that can be run to identify the child records associated with the parent column within a single table.....and between other tables?
Am I correct in assuming the parent column is the 'primary key'?
Thanks.....I'm a new to oracle...and need some help understanding
my company's crazy DB structure

You can use
User_Constraints
User_Cons_Columns
views to identify parent and child table columns
SELECT * FROM User_Constraints WHERE Constraint_Type = 'R' AND Table_Name = '<TABLENAME>';
SELECT * FROM User_Cons_columns WHERE Constraint_Name = '<Name from Above query>';
will give you columns of the parent table (if you use value from constraint_name) and of child table (if you use value from r_constraint_name).
HTH..

Writing a query to count entries for all tables

I'd like to write a query to count the number of rows in every table for a given database. For example, if I have two tables in a database called TEST1 and TEST2 with 20 and 30 rows respectively, I'd like the output of the query to be
TABLE_NAME          ROW_COUNT
TEST1               20
TEST2               30
Any ideas?

or justin,
How about this
SQL> ed
Wrote file afiedt.buf
1 declare
2 t_count number;
3 begin
4    dbms_output.put_line('table_name          Num_rows ');
5    dbms_output.put_line('----------         ---------- ');
6   for i in (select table_name from user_tables) loop
7    execute immediate 'select count(*) from '||i.table_name into t_count;
8    dbms_output.put_line(i.table_name||'       '||t_count);
9    end loop;
10* end;
SQL> /
table_name          Num_rows
EMP_TEST         0
BOOK            2
MONTH           36
BOOK_SALES           65
CURRENCY          2
EMP          18
BONUS          0
DEPT          5
SALGRADE         0
PLAN_TABLE         0
PL/SQL procedure successfully completed.

Set count of column in database......

hi All,
i just wanna to ask, it is possible that i can set count of column depends on data/input.
for example;
in common, when 2 column, code sql like:
String query3 = "INSERT INTO Sheet5(Rule, Weight)" + "VALUES ('"+ finalRule+"', '"+weight+"')";but if n column, how?
anybody knows or give me some idea to handle that..
thanks.

what do you means by using preparedStatement?
is it like this
String sql1 = "SELECT empno FRom emp WHERE empno = ?";
String sql2 = "INSERT INTO emp VALUES (?,?,?,?,?,?,?,?)";
PreparedStatement pstmt1 = conn.prepareStatement(sql1);
PreparedStatement pstmt2 = conn.prepareStatement(sql2);
pstmt1.setInt(1, 9999);
ResultSet rset = pstmt1.executeQuery();
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           rset.close();
     else {
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     pstmt2.setString(3, "ANALYST");
     pstmt2.setInt(4, 7566);
     pstmt2.setString(5, "01-jan-01");
     pstmt2.setFloat(6, 12000);
     pstmt2.setFloat(7, (float)10.5);
     pstmt2.setInt(8, 10);
     pstmt2.executeUpdate();
     }so, i still need to write 8 times '?' for 8 column.
but how if i don't know count of column?

Report Query using a Named Column Report Layout fails to produce PDF

I am testing FOP and the Shared Component Report Queries query with a Named Column Report Layout. The xsl file was built using Stylus Studio and worked fine with the saved XML data file in Stylus Studio.
500 Internal Server Error
500 Internal Server Error
Servlet error: An exception occurred.
The current application deployment descriptors do not allow for including it in this response.
Please consult the application log for details.
I assume this is a message from FOP. What do I do now?
tia,
Sam

Sam,
I would suggest to take APEX out of the picture first and see if you can get this to work directly with your FOP solution, i.e. generate the XML data and take your XSL file and then post it directly to the FOP JSP (or whichever rendering engine you use). If this works, the problem might be somewhere in your APEX configuration. If it doesn't work, then the problem is likely in your XSL or XML structure. Here's how you can setup a static HTML page to post your XML and XSL to FOP:
http://marcsewtz.blogspot.com/2008/06/heres-another-posting-on-pdf-printing.html
Regards,
Marc

Error querying fact: -2417217900 invalid column name

Dear Xperts
while validating script logic it gives error"error querying fact: -2417217900 invalid column name P_ACCT"
P_ACCT dimension created by me.
problem has started today while creating new script logic.
as old logic created earlier was sucessfully validated
new logic was created refering document 330 for bpc,so there is no scripting error
pls guide me through this.
thanks
kashyap

thanks for ur advice
i was able to validate logics previously.
i tried way you sugested but was unable to validate.
i also tried updating that dimension members but it was giving me some olap querry error while processing dimension after changing dimension members.
so finally i deleted that dimension created new one did whole process again
& was successfull
but i wanted to know why this error could have occured
thanks
kashyap

How can I make my query to compare only columns of two tables... not the storage information?

11GR2
=-----------------------------------
I am using below querry to compare two table that has same name, under two different users... But after making storage information false like below and if the storage information is different on column level than it create "Alter modify " statements for the column ... How can I make my query to compare only columns of two tables... not the storage information?
begin
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'PRETTY', TRUE);
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'SQLTERMINATOR',TRUE);
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'SEGMENT_ATTRIBUTES', FALSE);
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'STORAGE', FALSE);
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'TABLESPACE',FALSE);
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'CONSTRAINTS',FALSE);
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'REF_CONSTRAINTS',FALSE);
DBMS_METADATA.SET_TRANSFORM_PARAM(DBMS_METADATA.SESSION_TRANSFORM,'CONSTRAINTS_AS_ALTER',FALSE);
End;
select REGEXP_REPLACE(dbms_metadata_diff.compare_alter('TABLE','TABLE_NAME_A','TABLE_NAME_A','USER1','USER2'),('USER1...'),'', 1, 0, 'i') from dual

I am using below querry to compare two table that has same name, under two different users... But after making storage information false like below and if the storage information is different on column level than it create "Alter modify " statements for the column ... How can I make my query to compare only columns of two tables... not the storage information?
If you want help you have to SHOW us what you are doing and how you are doing it; you can't just try to tell us in your own words.
We can't see your computer screen.

Count of Column

I'm using Derby 10.5 via Command Interpreter
I stucked at the count of column
I need to know the command for getting number of columns used in a table .

ibanezplayer85 wrote:
Do you mean JTable? If so, check out the API. There's a method called [getColumnCount()|http://java.sun.com/j2se/1.5.0/docs/api/javax/swing/JTable.html#getColumnCount()] . If you're using a table model, there should also be a getColumnCount() method.
If this isn't what you meant, you will probably have to clarify.My guess: that this isn't a Java question but rather is a Derby question, but this is just a SWAG. Who knows?

Query to count of Columns??

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