Resukt:Get number of rows from 3 different table...?

Hi All,
I need to find out number of rows from 3 different table for the same conditions. Instead of writing 3 queries, is it possible to get it thru one query?
For example, i need to find out number of rows in tables where name = 'Ameet' from 3 different table, i will end writing 3 queries.
1. select count(1) from table_a where name = 'Ameet';
1. select count(1) from table_b where name = 'Ameet';
1. select count(1) from table_c where name = 'Ameet';
Is it possible to write a single query to get result of all above 3 queries?
result:
table_a table_b table_c
34 44 2

One way:
SELECT      (SELECT     COUNT(*) AS CNT FROM TABLE_A WHERE name='Ameet') AS TABLE_A
,     (SELECT     COUNT(*) AS CNT FROM TABLE_B WHERE name='Ameet') AS TABLE_B
,     (SELECT     COUNT(*) AS CNT FROM TABLE_C WHERE name='Ameet') AS TABLE_C
FROM DUALIf you want the total:
SELECT     SUM(CNT)
FROM
     SELECT     COUNT(*) AS CNT FROM TABLE_A WHERE name='Ameet'
     UNION ALL
     SELECT     COUNT(*) FROM TABLE_B WHERE name='Ameet'
     UNION ALL
     SELECT     COUNT(*) FROM TABLE_C WHERE name='Ameet'
)

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Hi,
1.Create two internal tables of same type and sort according to Kunnr then Delete the
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select * from kna1 into table kna1 up to 100 rows.
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read table t_kna2 transporting no-fields.
counter = sy-tfill."1st Method
loop at t_kna1 into kna1."2nd Method
at first.
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endat.
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Hi,
Consider tables A,B,C,D,E,F. all are having 100000++ records Tables B,C,D are dependent on table A (with foreign key constraint). When I am deleting records from all tables, table B,C,D are taking max 30-40 seconds while table A is taking 30-40 mins. All tables are having indexes.
Method I have used:
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3. please suggest options for me why it is taking too much time for deleting records in table A.
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Edited by: user12952025 on Apr 30, 2013 2:55 AM
Edited by: user12952025 on Apr 30, 2013 2:56 AM
Edited by: user12952025 on Apr 30, 2013 2:57 AM

user12952025 wrote:
Hi,
Consider tables A,B,C,D,E,F. all are having 100000++ records Tables B,C,D are dependent on table A (with foreign key constraint). When I am deleting records from all tables, table B,C,D are taking max 30-40 seconds while table A is taking 30-40 mins. All tables are having indexes.What attribute of the Foreign key is specified? Is it On Delete Cascade? If yes, then in a way, deleting data fro Child tables is un-necessary. Only a Delete from parent shall suffice.
>
Method I have used:
1. Created Temp table
2. then deleted all records from B,C,D,E,F for all records in temp table for limit of 500.
delete from B where exists (select 1 from temp where b.col1=temp.col1);
3. please suggest options for me why it is taking too much time for deleting records in table A.
Is there any thing that during deleting data from such master table, it is reffering to all dependent tables even if dependent data is not present ??? If yes then couls you please please suggest options for me to remove this ? I hope it won't go for CHECK constraints during deleting data.One another way is to "Switch-Off" the relationship while deleting the data.
ALTER TABLE table_name
disable CONSTRAINT constraint_nameAnd then Delete the data from each of tables.
You did specify the number of rows in each table, it would have been better to mention the number of rows to be deleted.
It is not a hard-and-fast way, but would generally perform better, to copy the data (to be retained) from Parent Table into a Temporary Table, Drop Parent Table and rename teh Temporary table to parent table. Similar can be performed on Child tables.
You may then Enable the Foreign key constraints.

How to compare two rows from two table with different data

how to compare two rows from two table with different data
e.g.
Table 1
ID   DESC
1     aaa
2     bbb
3     ccc
Table 2
ID   DESC
1     aaa
2     xxx
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Result
2

Create
table tab1(ID
int ,DE char(10))
Create
table tab2(ID
int ,DE char(10))
Insert
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(1,'aaa')
Insert
into tab1 Values
(2,'bbb')
Insert
into tab1 Values(3,'ccc')
Insert
into tab1 Values(4,'dfe')
Insert
into tab2 Values
(1,'aaa')
Insert
into tab2 Values
(2,'xx')
Insert
into tab2 Values(3,'ccc')
Insert
into tab2 Values(6,'wdr')
SELECT
tab1.ID,tab2.ID
As T2 from tab1
FULL
join tab2 on tab1.ID
= tab2.ID
WHERE
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How NOT to restrict no of rows from two tables

I have two identical tables Invoice and Payment. The only difference is Invoice_id,Invoice_Amt and Payment_id,Payment_Amt columns that shows different ids and amounts. The bank_ids, names, account_types are same. Invoice table has 3 rows and Payment has 2. Simply meaning that there were 3 invoices generated but the bank received 2 payments. I want to show Invoice_Amt and Payment_Amt using sql query. But its giving me total 6 rows. Whereas, I want 3 from Invoice and 2 rows from Payment table to show side-by-side.
CREATE TABLE invoice
( invoice_id NUMBER
bank_id NUMBER,
bank_name VARCHAR2(256),
invoice_amount NUMBER);
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CREATE TABLE payment
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bank_id NUMBER,
bank_name VARCHAR2(256),
payment_amount NUMBER);
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After executing this sql statement below, I get 6 rows:
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Thank you.

Hi,
So you want
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the 2nd invoice to appear side-by-side with the 2nd payment,
the nth invoice to appear side-by-side with the nth payment.
But, if there are an uneqaul numner of payments and invoices, all the payments and all the invoices must still be shown, alone on a row if necessary.
That sounds like a job for FULL OUTER JOIN.
Use the analytic ROW_NUMBER fucntion to determine which is the 1st, 2nd, ..., nth row in each table, for each bank.
WITH     invoice_plus_r_num     AS
     SELECT     bank_id, bank_name
     ,      invoice_amount
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                               ORDER BY         invoice_id
                       )         AS r_num
     FROM    invoice
,     payment_plus_r_num     AS
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     FROM    payment
SELECT       NVL (i.bank_id,   p.bank_id)          AS bank_id
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,       i.invoice_amount
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,       bank_name
,       NVL (i.r_num, p.r_num)
;You mentioned something about accounts, but didn't include that in the CREATE TABLE statements. You'll probably want to add that wherever I used bank_id and bank_name, above.
Are invoce and payment actually views, rather than tables? If not, you should have a separate bank table, and only include the bank_id in the other tables.
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If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all tables, and also post the results you want from that data.
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Edited by: Frank Kulash on Feb 3, 2011 12:32 PM

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regards,
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Ok, that only was to show simply that max option
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Table created.
-- warmed up the buffer cache with a couple of SELECTs against TESTAB in order
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COUNT(*)
10000
Execution Plan
Plan hash value: 2656308840
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 35 (9)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | TABLE ACCESS FULL| TESTTAB | 9262 | 35 (9)| 00:00:01 |
Note
- dynamic sampling used for this statement
Statistics
0 recursive calls
0 db block gets
131 consistent gets
0 physical reads
0 redo size
223 bytes sent via SQL*Net to client
238 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
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MAX(ROWNUM)
10000
Execution Plan
Plan hash value: 2387991791
| Id | Operation | Name | Rows | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 35 (9)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | | |
| 2 | COUNT | | | | |
| 3 | TABLE ACCESS FULL| TESTTAB | 9262 | 35 (9)| 00:00:01 |
Note
- dynamic sampling used for this statement
Statistics
0 recursive calls
0 db block gets
131 consistent gets
0 physical reads
0 redo size
225 bytes sent via SQL*Net to client
238 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
So seeing that we have the exact same baseline for both queries, and that PIO does not influence the results, we time a 1000 executions of both.
SQL> declare
2 cnt number;
3 begin
4 for i in 1..1000
5 loop
6 select count(*) into cnt from testtab;
7 end loop;
8 end;
9 /
PL/SQL procedure successfully completed.
Elapsed: 00:00:03.19
SQL>
SQL> declare
2 cnt number;
3 begin
4 for i in 1..1000
5 loop
6 select max(rownum) into cnt from testtab;
7 end loop;
8 end;
9 /
PL/SQL procedure successfully completed.
Elapsed: 00:00:15.87
SQL>
This shows that what makes the MAX() more expensive is just that - determining the MAX(). For each row, Oracle has to call its internal MAX() function with two values - the current max result and the new value. This function then returns the new max value. This overhead per row adds up to a significant overhead in execution time - making the MAX() approach 5x slower than the COUNT() approach.

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user52
Message was edited by:
user52
Message was edited by:
user52

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[Help3|http://wiki.sdn.sap.com/wiki/display/KMC/GettinganimagefromKMDocumenttobeusedinWeb+DynPro]
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Hi there All,
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I hava table which has diffrent columns of numeric Datatype.
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I can take the least value by least(col1,col2,col3 ...) function.Until this stage it is fine.
But also I have take 2nd least value and 3rd least value, which I am quite unsure how to get it.
Looking forward for suggestions.
Thanks in Advance.
Regards,
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scott@ORA92> -- test data:
scott@ORA92> SELECT * FROM your_table
2 /
      COL1       COL2       COL3
         1          2          3
         4          6          5
         8          7          9
        11         12         10
        15         13         14
        18         17         16
6 rows selected.
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scott@ORA92> create or replace type myTableType as table of number;
2 /
Type created.
scott@ORA92> create or replace function str2tbl( p_str in varchar2 )
2 return myTableType
3 as
4       l_str      long default p_str || ',';
5       l_n         number;
6       l_data    myTableType := myTabletype();
7 begin
8       loop
9           l_n := instr( l_str, ',' );
10           exit when (nvl(l_n,0) = 0);
11           l_data.extend;
12           l_data( l_data.count ) := ltrim(rtrim(substr(l_str,1,l_n-1)));
13           l_str := substr( l_str, l_n+1 );
14       end loop;
15       return l_data;
16 end;
17 /
Function created.
scott@ORA92> CREATE OR REPLACE FUNCTION nleast
2    (p_n        IN NUMBER,
3      p_nums        IN VARCHAR2)
4    RETURN           NUMBER
5 AS
6    v_nleast      NUMBER;
7 BEGIN
8    SELECT DISTINCT column_value
9    INTO   v_nleast
10    FROM   (SELECT column_value,
11                 DENSE_RANK () OVER (ORDER BY column_value) AS num_rk
12             FROM   (select *
13                  from   table (CAST (str2tbl (p_nums) AS mytabletype)))
14            WHERE   column_value IS NOT NULL)
15    WHERE num_rk = p_n;
16    RETURN v_nleast;
17 EXCEPTION
18    WHEN OTHERS THEN RETURN NULL;
19 END nleast;
20 /
Function created.
scott@ORA92> SHOW ERRORS
No errors.
scott@ORA92> -- query:
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2          LEAST (col1, col2, col3) AS the_least,
3          nleast (1, col1 || ',' || col2 || ',' || col3) AS first_least,
4          nleast (2, col1 || ',' || col2 || ',' || col3) AS second_least,
5          nleast (3, col1 || ',' || col2 || ',' || col3) AS third_least,
6          nleast (4, col1 || ',' || col2 || ',' || col3) AS fourth_least
7 FROM   your_table
8 /
      COL1       COL2       COL3 THE_LEAST FIRST_LEAST SECOND_LEAST THIRD_LEAST FOURTH_LEAST
         1          2          3          1           1            2           3
         4          6          5          4           4            5           6
         8          7          9          7           7            8           9
        11         12         10         10          10           11          12
        15         13         14         13          13           14          15
        18         17         16         16          16           17          18
6 rows selected.

Resukt:Get number of rows from 3 different table...?

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