Sql query and dual table

Hi,
1. Do dual table take any physical space in the database or it is only logically present?
2. Suppose a table contains 100 rows. Write a query to return 42,43,44 rows.
Thanks,
Mrinmoy

user3001930 wrote:
Hi,
1. Do dual table take any physical space in the database or it is only logically present?Dual table is physically stored. But starting from 10g (I guess) they indroduced the FAST DUAL access path. Which means if you use the DUAL table not to get the value from the table and only to select a constant value then it will not hit the actually table.
2. Suppose a table contains 100 rows. Write a query to return 42,43,44 rows.You can use the analytic function ROW_NUMBER for this purpose.

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CREATE TABLE Customer
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GO
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Saeid Hasani
Database Consultant
Please feel free to contact me at [email protected] as well as on Twitter and Facebook.
[My Writings on TechNet Wiki] [T-SQL Blog] [Curah!]
[Twitter] [Facebook] [Email]

Weird problem with mysql query and data table buttons !!!!

Hi,
I'm using jsc 2 update 1 on windows and mysql 4.1 . I have a page with a data table. One column of the data table contains "Details" buttons.
Source query for the table is :
SELECT tbl_tesserati.idtbl_tesserati idTesserato,
tbl_tesserati.num_tessera,
tbl_tesserati.nome,
tbl_societa.codice_meccanografico
FROM tbl_tesserati
INNER JOIN tbl_rel_tesserato_discipline_societa ON tbl_tesserati.idtbl_tesserati = tbl_rel_tesserato_discipline_societa.id_tesserato
INNER JOIN tbl_cariche ON      tbl_rel_tesserato_discipline_societa.id_carica = tbl_cariche.idtbl_cariche
INNER JOIN tbl_qualifiche ON      tbl_rel_tesserato_discipline_societa.id_qualifica = tbl_qualifiche.idtbl_qualifiche
INNER JOIN tbl_discipline ON      tbl_rel_tesserato_discipline_societa.id_disciplina = tbl_discipline.idtbl_discipline
INNER JOIN tbl_societa ON      tbl_rel_tesserato_discipline_societa.id_societa = tbl_societa.idtbl_societa
LEFT JOIN tbl_province ON tbl_societa.provincia_sede_sociale = tbl_province.idtbl_province
LEFT JOIN tbl_comuni ON tbl_societa.comune_sede_sociale = tbl_comuni.idtbl_comuni
LEFT JOIN tbl_rel_tesserato_discipline_praticate ON tbl_rel_tesserato_discipline_praticate.tessera_id=
tbl_rel_tesserato_discipline_societa.idtbl_rel_tesserato_discipline
LEFT JOIN tbl_discipline_praticate ON tbl_discipline_praticate.idtbl_disciplina_praticate=tbl_rel_tesserato_discipline_praticate.disciplina_praticata_id
WHERE
tbl_tesserati.cognome LIKE ?
AND tbl_tesserati.nome LIKE ?
AND tbl_rel_tesserato_discipline_societa.id_societa LIKE ?
AND tbl_tesserati.idtbl_tesserati LIKE ?
AND tbl_cariche.idtbl_cariche LIKE ?
AND tbl_qualifiche.idtbl_qualifiche LIKE ?
AND tbl_tesserati.data_nascita >= ?
AND tbl_tesserati.data_nascita<= ?
AND tbl_discipline.idtbl_discipline LIKE ?
AND codice_affiliazione LIKE ?
AND tbl_societa.denominazione LIKE ?
AND YEAR(tbl_rel_tesserato_discipline_societa.data_scadenza) LIKE ?
AND (tbl_province.nome LIKE ? OR tbl_province.nome IS NULL)
AND ( tbl_comuni.nome LIKE ? OR tbl_comuni.nome IS NULL)
The tbl_tesserati.data_nascita is a mysql date field.
The click event handler code for the "Details" Button is:
public String btnModificaTesserato_action() {
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If i set a breakpoint in the code line TableRowDataProvider rowData= (TableRowDataProvider)getBean("currentRowTesserati");the debbuger does not stop the code execution ! As if the button was never clicked!
I tried to modify the source query to :
SELECT tbl_tesserati.idtbl_tesserati idTesserato,
tbl_tesserati.num_tessera,
tbl_tesserati.nome,
tbl_societa.codice_meccanografico
FROM tbl_tesserati
INNER JOIN tbl_rel_tesserato_discipline_societa ON tbl_tesserati.idtbl_tesserati = tbl_rel_tesserato_discipline_societa.id_tesserato
INNER JOIN tbl_cariche ON      tbl_rel_tesserato_discipline_societa.id_carica = tbl_cariche.idtbl_cariche
INNER JOIN tbl_qualifiche ON      tbl_rel_tesserato_discipline_societa.id_qualifica = tbl_qualifiche.idtbl_qualifiche
INNER JOIN tbl_discipline ON      tbl_rel_tesserato_discipline_societa.id_disciplina = tbl_discipline.idtbl_discipline
INNER JOIN tbl_societa ON      tbl_rel_tesserato_discipline_societa.id_societa = tbl_societa.idtbl_societa
LEFT JOIN tbl_province ON tbl_societa.provincia_sede_sociale = tbl_province.idtbl_province
LEFT JOIN tbl_comuni ON tbl_societa.comune_sede_sociale = tbl_comuni.idtbl_comuni
LEFT JOIN tbl_rel_tesserato_discipline_praticate ON tbl_rel_tesserato_discipline_praticate.tessera_id=
tbl_rel_tesserato_discipline_societa.idtbl_rel_tesserato_discipline
LEFT JOIN tbl_discipline_praticate ON tbl_discipline_praticate.idtbl_disciplina_praticate=tbl_rel_tesserato_discipline_praticate.disciplina_praticata_id
WHERE
tbl_tesserati.cognome LIKE ?
AND tbl_tesserati.nome LIKE ?
AND tbl_rel_tesserato_discipline_societa.id_societa LIKE ?
AND tbl_tesserati.idtbl_tesserati LIKE ?
AND tbl_cariche.idtbl_cariche LIKE ?
AND tbl_qualifiche.idtbl_qualifiche LIKE ?
AND tbl_tesserati.data_nascita >= ?
OR tbl_tesserati.data_nascita<= ?
AND tbl_discipline.idtbl_discipline LIKE ?
AND codice_affiliazione LIKE ?
AND tbl_societa.denominazione LIKE ?
AND YEAR(tbl_rel_tesserato_discipline_societa.data_scadenza) LIKE ?
AND (tbl_province.nome LIKE ? OR tbl_province.nome IS NULL)
AND ( tbl_comuni.nome LIKE ? OR tbl_comuni.nome IS NULL)
Using this query everything works well !! The click handler works and the debugger too !!
I changed only the AND in OR !!!
I also tried to change mysql-x-x-connector driver but without solving my problem.
Can someone help me ?
Thanks
Giorgio

You'll find that it is more to do with the way MySql deals with dates than anything else! Depending on how your date field is setup, then try using a BETWEEN statement for those 2 lines in your first query e.g.
AND ( tbl_tesserati.data_nascita BETWEEN ? AND ?)
The date column needs to be in the ISO format to work. If you examine your second query output, you might discover that the output is only going to refer to one parameter (probably the OR one). Did you manage to view the output logs from the application server? You would have got an idea from there with a message like stating a conversion error'.
Alternatively, you could try using the to_days() function and convert it directly to a number which would be a lot easier to deal with. For example:
AND to_days(tbl_tesserati.data_nascita >= ? )
AND to_days( tbl_tesserati.data_nascita<= ? )
Or try the BETWEEN version with to_days() and see what you get.
More info about date formatting (v5) here:
http://dev.mysql.com/doc/refman/5.0/en/date-and-time-functions.html#function_to-days
Before I forget, sometimes you may need to treat dates as Strings rather 'Long' as you did.
As a matter of interest, did you try your query in a different piece of software?
If my queries are a little more complicated, I tend to try MySql queries out in the free MySql query browser and also double check in another to verify certain issues. I found it easier to develop SQL in a seperate program then import the final version to JSC making the required modifications for parameters.
Message was edited by:
aerostra

Error while executing SQL query -' Must Specify Table to select from'

Hi all,
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Please give y'r ideas to solve the problem.
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try this, it works fine in my B1:
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Regards

Creating sql query using 3 tables

There is database (supposed to be relational but it is not) and
I cannot change the tables and it is very difficult to create SQL query.
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time timestamp
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As I already mentioned, I received another conditions for the query, and when I create a new one, I
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a1 number 5,0
a2 char 7 (the same as t2.a2 when is trimmed)
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a_time timestamp
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a2 char 15
b1 number 1,0
b2 char 1,0
b3 char 4
b4 char 4
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c1 char 4
c2 number 7,3
c3 number 8,4
b3 char 4
where if c1='MIN' c2, c3 return min values,
and if c1='MAX' c2,c3 return max values
SQL query:
select t1.a1, t1.a2, t2.b1, t2.b2, t2.b3, t1.a3, t1.a4, t3.c1,
t3.c2, t3.c3, t2.b4
from t1, t2, t3
where (TRIM(t1.a2)=TRIM(t2.a2)
and t1.a1=19
and ((to_char(t1.a_time, 'YYYY-MM-DD') >= '2006-03-15')
and (to_char(t1.a_time, 'YYYY-MM-DD') <= '2006-03-16')))
and t3.b3=t2.b3)
order by t1.a_time
Result set:
a1, a2, b1, b2, b3, a3, a4, c1('MAX'), c2', c3', b4
a1, a2, b1, b2, b3, a3, a4, c1('MIN'), c2", c3", b4
So when I executed SQL query it returns 2 rows for the same a2.
I want to get 1 row for each a2 together with c3 (c4) min and c3 (c4) max values.
How to name columns for c2 min and c2 max (the same for c3) in order to retreive 1 row per a2 value, something like this:
a1, a2, b1, b2, b3, a3, a4, c2min, c2max, c3min, c3max, b4
Thanks

Sql query and dual table

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