Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you may not be able to execute some actions.

Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).

rownum

R
Raziyah00 last edited by
Have a large number of tables Am with a big ring, m - some index. I'm making this request:
```
SELECT * FROM A1, A2, ... An WHERE ROWNUM < 2;
```
And my request is up. Logically, the bd should choose the first lines from each table, collect them in one, assign one and remove them. Why is it taking too long?
Reply Quote 0
1 Reply Last reply
S
simrah last edited by
The logic of the database looks different. The request contains a decarto work, all the lines of all the tables are multiplied by each other because the conditions of the tables are not specified in the section where/join. Once the lines are combined in all possible combinations, the first line will be taken. That's why it took so long. The problem can be solved by several methods, the simplest, to replace the listing of the sub-request tables:
```
select * 
from 
    (select * from a1 where rownum < 2), 
    (select * from a2 where rownum < 2)...
```
Reply Quote 0
1 Reply Last reply

2
Posts

0
Views

Suggested Topics

J

Determine the extradition point with the largest or smallest readers
Software Programming • sql server sql database request • • jonetta

2

0
Votes

2
Posts

0
Views

E

For example, for the maximum value (for minimum MIN instead of MAX):SELECT код_пункта ,тип ,факультет ,MAX([Количество читателей]) AS [Максимальное количество] FROM ( select выдача.код_пункта ,тип ,[Пункт Выдачи].факультет ,count(distinct код_билета) as [Количество читателей] from dbo.Выдача inner join dbo.[Пункт Выдачи] on dbo.Выдача.код_пункта = dbo.[Пункт Выдачи].код_пункта where дата_возврата > getdate() group by выдача.код_пункта ,тип ,[Пункт Выдачи].факультет ) t GROUP BY код_пункта ,тип ,факультет
R

Extract the second parameter in the request from max
Software Programming • sql • • Raziyah00

2

0
Votes

2
Posts

0
Views

K

I don't know why the first request works and what he's driving.If you're looking for a maximum ID, what ID do you want to see? For now:SELECT IDNEWSPAPER, SUM(COUNT) FROM DELIVERY, NEWSPAPER WHERE DELIVERY.IDNEWSPAPERKEY=NEWSPAPER.IDNEWSPAPER GROUP BY NEWSPAPER.IDNEWSPAPER having SUM(COUNT) >= ALL(SELECT SUM(COUNT) FROM DELIVERY, NEWSPAPER WHERE DELIVERY.IDNEWSPAPERKEY=NEWSPAPER.IDNEWSPAPER GROUP BY NEWSPAPER.IDNEWSPAPER );
R

How to make conditional join when containing Nulls in some columns use for join
SQL, Database Testing • oracle join • • rosemadder

2

0
Votes

2
Posts

0
Views

C

First of all, your description does not match the ON condition. Your description would fit an ON like this: Select ... from ... meas_data m left outer join tlea t on m.dset_cob_dt = t.tlea_cob_dt and m.tlsn_trd_id = t.tlsn_trd_id and ( m.tlsn_vrsn_num = t.tlsn_vrsn_num and m.tlsn_leg_id = t.tlsn_leg_id or m.tlsn_vrsn_num = t.tlsn_vrsn_num and m.tlsn_leg_id is null or m.tlsn_vrsn_num is null ) As for efficiency, I'd suggest a composite index on the 4 columns, on each table (but I'm nowhere near a Oracle expert, so take this suggestion with caution).
C

MySQL @rownum UPDATE correlative based on a parent_id
Software Programming • mysql sql update • • charlenef

2

0
Votes

2
Posts

0
Views

Z

If someone needs to update a correlative based on a parent_id with a single update, this would be the syntax in MySQLset @row_number := 0; UPDATE personal_antecedente pa INNER JOIN ( SELECT @row_number:=CASE WHEN @personal_id = tabla.idPersonal THEN @row_number + 1 ELSE 1 END AS num, @personal_id:= tabla.idPersonal idPersonal, tabla.idAntecedente FROM ( SELECT idAntecedente, idPersonal FROM personal_antecedente ORDER BY idPersonal ) as tabla ORDER BY idPersonal) AS pa2 ON (pa2.idAntecedente = pa.idAntecedente) SET pa.correlativo = pa2.num Source: https://docs.microsoft.com/es-es/sql/t-sql/functions/row-number-transact-sql?view=sql-server-ver15 https://www.mysqltutorial.org/mysql-row_number/
A

Bug with comment after RowNum
Software Programming • sql oracle oracle12c • • Avante

2

0
Votes

2
Posts

0
Views

K

I couldn't find an explanation for all this in one place. However, most parts google.ROWNUM ♪ https://docs.oracle.com/database/121/SQLRF/pseudocolumns009.htm#SQLRF00255 ♪ The effect you've noticed applies to any expression. The stockholder himself has a name and an expression is not, so the name for expression is generated if it's not clearly put. For example: select dummy, dummy x, 2*2, 2*2 /*duplicate*/, rownum, rownum -- preved from dual; D X 22 22/DUPLICATE/ ROWNUM ROWNUM--PREVED X X 4 4 1 1 The generosity rules have not yet been diagnosed. I'll find it. If anyone knows, you can boldly rule the answer.Got it. https://docs.oracle.com/database/121/SQLRF/sql_elements008.htm#SQLRF00223 - it says the top register:Non "ed identifiers are not case sensitive. Oracle interprets them as uppercase. Quoted identifiers are case sensitive.
Improve query SQL Laravel
Software Programming • sql laravel mvc • • jeanid

2

0
Votes

2
Posts

0
Views

R

I tried to understand the problem as much as I could, so the consultation remained: if ($tipo == 0) { $equipamientos = DB::table('equipamientos') ->leftjoin('relaciones', function($join){ $join->on('equipamientos.id_e','relaciones.equipamiento'); $join->on('relaciones.estado','=',DB::raw("1")); }) ->leftjoin('puestos', function($join) use ($puesto){ $join->on('puestos.id_puesto','relaciones.puesto') ->where('puestos.desc_puesto','LIKE', "%$puesto%"); }) ->leftjoin('personas','puestos.persona','personas.id_p') ->leftjoin('area','puestos.area','area.id_a') ->where(function($q) use ($ip) { $q->where('equipamientos.ip', 'LIKE', "%$ip%") ->orWhere('equipamientos.ip', '=', null); }) ->where('equipamientos.id_e', 'LIKE', "%$equipo%"); if ($puesto != null){ //La busqueda por puesto } if($usuario != null) $equipamientos ->where(function($q) use ($usuario) { $q->where('personas.nombre_p', 'LIKE', "%$usuario%") ->orWhere('personas.apellido', 'LIKE', "%$usuario%"); }); if ($area != null) $equipamientos->where('area.nombre_a', 'LIKE', "%$area%") $equipamientos ->select('equipamientos.id_e as id_equipamiento','puestos.desc_puesto as puesto' , 'equipamientos.ip as ip','area.nombre_a as area', 'personas.nombre_p as nombre', 'personas.apellido as apellido', 'relaciones.id_r as relacion') ->orderBy('id_equipamiento','asc') ->paginate(20); } return view ('equipamiento.inicio', array('equipamientos'=>$equipamientos, 'equipo'=>$equipo,'puesto'=>$puesto,'ip'=>$ip,'tipo_equipamiento'=>$tipo_equipamiento, 'usuario'=>$usuario, 'area'=>$area, 'acceso'=>$acceso)); } I'll leave you a link if you want more information about https://m.dotdev.co/writing-advanced-eloquent-search-query-filters-de8b6c2598db .
Error in persistence. xml when connecting oracle bank
Software Programming • java oracle hibernate persistenc languagee • • jeanid

2

0
Votes

2
Posts

0
Views

S

As quoted in the comments, your settings use MySQL and not Oracle.To use Oracle do:<?xml version="1.0" encoding="UTF-8"?> <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd" version="2.0"> <persistence-unit name="app_crud_cliente"> <provider>org.hibernate.ejb.HibernatePersistence</provider> <class>br.com.model.ClienteModel</class> <properties> <property name="javax.persistence.jdbc.driver" value="oracle.jdbc.driver.OracleDriver"/> <property name="javax.persistence.jdbc.url" value="jdbc:oracle:thin:@ip:porta/nome-da-instancia" /> <property name="javax.persistence.jdbc.user" value="DBA" /> <property name="javax.persistence.jdbc.password" value="DBA" /> <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect"/> </properties> </persistence-unit> </persistence> Note: The dialect can change depending on your Oracle version.
G

Can you use two @rownum in the same select?
Software Programming • mysql • • guilherme

2

0
Votes

2
Posts

0
Views

O

The error is given because you are using the same varibale @numrow. You should create another, with a different name, for example @numrow2.So:SELECT @rownum:=@rownum+1 ‘fila’, @rownum2:=@rownum2+1 ‘sublista’, nombre FROM personal t, (SELECT @rownum:=0) r, (SELECT @rownum2:=5) s Or using variables with more intuitive names:SELECT @fila:=@fila+1 ‘fila’, @sublista:=@sublista+1 ‘sublista’, nombre FROM personal t, (SELECT @fila:=0) r, (SELECT @sublista:=5) s
Prohibition of the removal of records
Software Programming • sql oracle trigger plsql constraints • • Mystic

2

0
Votes

2
Posts

0
Views

B

The best solution would be to check the condition for the removal of records prior to the commencement of DML.But let's say we need a "protection from a fool" and we need to avoid the removal of the records. For example, prefix recordings '**' One of the pillars. Then we'll have to cover the exceptions. https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/INSERT.html#GUID-903F8043-0254-4EE9-ACC1-CB8AC0AF3423__BGBDIGAH ♪ The full DML proposal would then be implemented. There you go.create table t1 as select rownum id, case when mod (rownum, 3) = 0 then '**' end||'memo '||rownum memo from xmlTable ('1 to 9'); create or replace trigger t1FullProofOnDelete before delete on t1 for each row when (substr (old.memo, 1, 2) = '**') begin raise_application_error (-20000, 'wrong deletion'); end; / delete from t1 where id=9; Expected error in removal by condition:ORA-20000: wrong deletionIf removed without conditions, as expected, 6 records will be removed, and the exceptions will remain and will be recorded in the error logging table: exec dbms_errlog.create_error_log (dml_table_name => 't1'); delete from t1 log errors reject limit unlimited; 6 rows deleted. select t1.id, t1.memo, regexp_substr (ora_err_mesg$, '.*$', 1, 1, 'm') err from t1 join err$_t1 e on e.id = t1.id; ID MEMO ERR 3 **memo 3 ORA-20000: wrong deletion 6 **memo 6 ORA-20000: wrong deletion 9 **memo 9 ORA-20000: wrong deletion
A

what is the correct name for "rich" views?
SQL, Database Testing • mysql postgresql oracle view • • Anderson

2

0
Votes

2
Posts

0
Views

P

Materialized view. Overview of Materialized Views Materialized Views
S

Upload files using ajax
Software Programming • php sql ajax • • Saumya

2

0
Votes

2
Posts

0
Views

C

that I know is not possible with the languages on the user's side for security issues, you can do it with php that is a language on the server side.This was taken from https://www.w3schools.com/php/php_file_upload.asp <?php $target_dir = "uploads/"; $target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]); $uploadOk = 1; $imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION)); // Check if image file is a actual image or fake image if(isset($_POST["submit"])) { $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]); if($check !== false) { echo "File is an image - " . $check["mime"] . "."; $uploadOk = 1; } else { echo "File is not an image."; $uploadOk = 0; } } ?>
R

Update field1.table1 based on compound join between table1 and table2 - Oracle
SQL, Database Testing • oracle update oracle 11g r2 dml • • Rossere

2

0
Votes

2
Posts

0
Views

A

update table1 set flag_column = 1 where exists (select 1 from table2 where table1.columnx = table2.columnx and table1.columny = table2.columny) This will update every row in table 1 where the x, y column combination exists in table2.
Use of ROWNUM to create a unique key
Software Programming • sql oracle • • briley

2

0
Votes

2
Posts

0
Views

D

@MikeSELECT ROW_NUMBER() OVER(ORDER BY A) AS REC_NUMBER, T.* FROM T ORDER BY A
J

How to format an XML powered from a BD query?
Software Programming • c sharp sql xml • • Jolied

2

0
Votes

2
Posts

0
Views

O

If you are using SQL Server you can use the "For xml" clause as follows:SELECT idEmpleado, NombreEmpleado FROM EMPLEADOS WHERE idEmpleado = 2 for xml auto() Any additional doubt query https://docs.microsoft.com/en-us/sql/relational-databases/xml/use-auto-mode-with-for-xml?view=sql-server-2017
Using ROWNUM to filter between minimum and maximum value returns 0 results
Software Programming • sql oracle • • emmalee

2

0
Votes

2
Posts

0
Views

A

It's not the right way to use ROWNUMIt should be like this:SELECT * FROM (SELECT *, ROWNUM RN FROM TABLA ) WHERE RN BETWEEN VALOR1 AND VALOR2 The rownum is "materialized" within the subconsult.

rownum

Suggested Topics

Determine the extradition point with the largest or smallest readers Software Programming • sql server sql database request • • jonetta

Extract the second parameter in the request from max Software Programming • sql • • Raziyah00

How to make conditional join when containing Nulls in some columns use for join SQL, Database Testing • oracle join • • rosemadder

MySQL @rownum UPDATE correlative based on a parent_id Software Programming • mysql sql update • • charlenef

Bug with comment after RowNum Software Programming • sql oracle oracle12c • • Avante

Improve query SQL Laravel Software Programming • sql laravel mvc • • jeanid

Error in persistence. xml when connecting oracle bank Software Programming • java oracle hibernate persistenc languagee • • jeanid

Can you use two @rownum in the same select? Software Programming • mysql • • guilherme

Prohibition of the removal of records Software Programming • sql oracle trigger plsql constraints • • Mystic

what is the correct name for "rich" views? SQL, Database Testing • mysql postgresql oracle view • • Anderson

Upload files using ajax Software Programming • php sql ajax • • Saumya

Update field1.table1 based on compound join between table1 and table2 - Oracle SQL, Database Testing • oracle update oracle 11g r2 dml • • Rossere

Use of ROWNUM to create a unique key Software Programming • sql oracle • • briley

How to format an XML powered from a BD query? Software Programming • c sharp sql xml • • Jolied

Using ROWNUM to filter between minimum and maximum value returns 0 results Software Programming • sql oracle • • emmalee

Determine the extradition point with the largest or smallest readers
Software Programming • sql server sql database request • • jonetta

Extract the second parameter in the request from max
Software Programming • sql • • Raziyah00

How to make conditional join when containing Nulls in some columns use for join
SQL, Database Testing • oracle join • • rosemadder

MySQL @rownum UPDATE correlative based on a parent_id
Software Programming • mysql sql update • • charlenef

Bug with comment after RowNum
Software Programming • sql oracle oracle12c • • Avante

Improve query SQL Laravel
Software Programming • sql laravel mvc • • jeanid

Error in persistence. xml when connecting oracle bank
Software Programming • java oracle hibernate persistenc languagee • • jeanid

Can you use two @rownum in the same select?
Software Programming • mysql • • guilherme

Prohibition of the removal of records
Software Programming • sql oracle trigger plsql constraints • • Mystic

what is the correct name for "rich" views?
SQL, Database Testing • mysql postgresql oracle view • • Anderson

Upload files using ajax
Software Programming • php sql ajax • • Saumya

Update field1.table1 based on compound join between table1 and table2 - Oracle
SQL, Database Testing • oracle update oracle 11g r2 dml • • Rossere

Use of ROWNUM to create a unique key
Software Programming • sql oracle • • briley

How to format an XML powered from a BD query?
Software Programming • c sharp sql xml • • Jolied

Using ROWNUM to filter between minimum and maximum value returns 0 results
Software Programming • sql oracle • • emmalee