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Consolidated conclusion without joining

J
jonetta last edited by
A table a c Fields:
```
 _id | name | code 
-----+------+------
```
is the table b c Fields:
```
 clientId | itemId | itemType 
----------+--------+----------
```
Help me get a request (without the johns) where all the meanings will be removed. a and dynamic column foo with value true/falsewhich will be displayed, the presence of a table record bcomparison columns a._id = b.itemId♪
I guess we should use something like that. select _id, 'foo' as "i_am_foo" from a; for the addition of a dynamic column and SELECT EXISTS(SELECT 1 FROM b WHERE true) as "foo";
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J
juvenalb last edited by
```
select
    a.*, -- все поля из а
    exists (select 1 from b where b.itemId = a._id) foo 
from a;
```
https://sqlize.online/?phpses=null&sqlses=93ba242b065faf41b5ba0b1948e5f35e&php_version=null&sql_version=psql14
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Problems with running (System.Data.SqlClient.SqlException)
Software Programming • c sharp sql server sql • • baileigh

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I see two mistakes in your code:First, space in the query string. He missed a space after "INSERTED.ID" and before "VALUES": SqlCommand inserirAluno = new SqlCommand("INSERT INTO ALUNOS (Nome, DataNascimento, CPF, Endereco, Bairro, " + "CEP, Cidade, IdEstado, Sexo) OUTPUT INSERTED.ID " + Second, treat return null. If no lines are included for any reason, ExecuteScalar will return null, giving cast error to int, then it is advisable to treat:int id = 0; var resultado = inserirAluno.ExecuteScalar(); if (resultado!= null) { id = (int)resultado; }
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Problem with supplying the mass to the OBD Python: int' object is not iterable
Software Programming • python sql database sqlite • • courtlanda

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If ar contains exactly as many columns in the table to add one line to the table. Goods:#!/usr/bin/env python import sqlite3 c = sqlite3.connect(':memory:') c.execute('create table goods (age, name)') ar = [1, '2'] c.execute('insert into goods values (%s)' % ','.join('?'*len(ar)), ar) print(*c.execute('select * from goods')) -> (1, '2')
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What would a React code look like without a shabby line and without a conditional (ternary) operator and if else?
Software Programming • javascript reactjs • • simrah

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We can create a variable:let buttonClass; if(active===i){ buttonClass = 'active'; }else{ buttonClass = ''; } ... <button className={'tablinks '+buttonClass} onClick={openTab} data-index={i} >{n.title}</button> We can try the function:<button className={'tablinks '+(function isActive(active,i){ if(active===i){ return 'active'; }else{ return ''; } })(active,i)} onClick={openTab} data-index={i} >{n.title}</button>
Select and inner join
Software Programming • php mysql • • Marcee

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Thanks to the light of colleagues Edvaldo and Ronaldo, I managed to solve my problem. Simply changing the INNER JOIN for LEFT JOIN, in this way, when consulting (buska), mysql compares the table (left) 'perfil' with the tables (right) 'civil state', 'titulo' and uf_oab, if you cannot make the comparison it returns 'null' to the tables of the right (right), we can thus fill these fields with null when the change. Good studies, everyone!
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What's the difference between INNER JOIN and OUTER JOIN?
Software Programming • sql join • • Amritpal

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Suppose you want to do a pole connection without duplicates, which is quite common:Internal connection A and B: A crosses B, i.e. the internal part of the intersection http://en.wikipedia.org/wiki/Venn_diagram ♪External connection A and B: A is connected to B, i.e. the external part of the compound in the Vienna diagram.ExamplesLet's say you have two tables. Each consists of one column with the following values:A B - - 1 3 2 4 3 5 4 6 Note that (1.2) are unique to A, (3.4) common elements and (5,6) unique to B.Internal connectionAn internal connection using one of the equivalent requests allows the intersection of two tables, two lines common to each.select * from a INNER JOIN b on a.a = b.b; select a.*, b.* from a, b where a.a = b.b; a | b --+-- 3 | 3 4 | 4 Left external connectionThe result of the left external connection is all the lines of Table A plus all the lines of Table B that have a match to the lines of Table A.select * from a LEFT OUTER JOIN b on a.a = b.b; select a., b. from a, b where a.a = b.b(+); a | b --+----- 1 | null 2 | null 3 | 3 4 | 4 Right external connectionThe result of the right external connection is all the lines ofs of Table B plus all the lines of Table A that match the lines of Table B.select * from a RIGHT OUTER JOIN b on a.a = b.b; select a.,b. from a,b where a.a(+) = b.b; a | b -----+---- 3 | 3 4 | 4 null | 5 null | 6 Full external connectionThe result of the complete external connection is the connection of tables A and B, that is, all lines A and all lines B. If any part of Table A does not conform to Table B, this Part B is empty and vice versa.select * from a FULL OUTER JOIN b on a.a = b.b; a | b -----+----- 1 | null 2 | null 3 | 3 4 | 4 null | 6 null | 5 Translation of response https://stackoverflow.com/a/38578/564240 ” https://stackoverflow.com/users/116/mark-harrison ♪
A

Data management MYSQL, returns null values
Software Programming • mysql sql table null • • Avante

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Although the subconsultation is not necessary, the GROUP BY You must do it alone. grupo and not grupo, asistenciaselect A_grupo as grupo, case when asistencia = 'A' then ifnull(count(asistencia), '') end as Asistencias, case when asistencia = 'F' then ifnull(count(asistencia), '') end as Faltas, case when asistencia = 'P' then ifnull(count(asistencia), '') end as Permisos, case when asistencia = 'R' then ifnull(count(asistencia), '') end as Retardos from pasalista inner join alumnos on pasalista.A_Ncontrol=alumnos.A_Ncontrol where pasalista.id_Materia=1 group by grupo
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Doctrine, join with conditions on ON
Software Programming • php symfony doc languagetrine • • Oba22

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There is no need to make an RW within the JOIN ON. Instead you can use leftJoin, as if I'm not mistaken, you want to get all the records from the 'order' table, even if they don't have any associated 'sap_order_status' record. The doctrine consultation would be like this:$repositorio = $this->getDoctrine()->getRepository(Order::class); $qb = $repositorio->createQueryBuilder('o') ->leftJoin('o.state_order', 'so') ->where('so.cancelled = false'); $resultado = $qb->getQuery()->getResult(); Don't forget:Import the class 'Order'On the leftJoin, the 'o.state_order', it should correspond to the name of the class property'Order'that has the relationship with the class'OrderStatus'.I hope it serves you, greetings!
Optimization of subcontracting
Software Programming • mysql sql • • carriann

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I answered myself: This request can be implemented with LEFT JOINSELECT ol.id AS orderId, ol.id_user AS userId, IF(u.name IS NULL, ol.name, u.name) AS userName FROM order_list ol LEFT JOIN USER u ON ol.id_user = u.id
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Want to get additional elements in join while joining.include
Software Programming • raily on rails • • jules

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spots = Spot.includes(:spot_datum).select('spots.*, version() as version') Comment You should have created two SQLs that you want to get to s_data first from the SQLs table. eager loadingActiveRecordThe result obtained isActiveRecord::BaseThis is mapped to the model.SpotMap to the model.SpotDatumTo accessspots.first.spot_datumshould be accessed.Homeselect('spots.*,spot_data.*,Since raw SQL concepts such as ActiveRecord are not chewed, I think it is difficult to write raw SQL directly if you want such things and receive the result with 結果を.ActiveRecord::Base.connection.select_all('SELECT spots.* ...').to_hash Reference- http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html - https://qiita.com/south37/items/b2c81932756d2cd84d7d
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Sync offline PostgreSQL server
SQL, Database Testing • postgresql • • shizuka

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One-way read-only replica If one is a read-only replica and the other one is the master, you can and should use WAL archive shipping for this. The master generates WAL and stores it somewhere accessible to both servers. Some like to use WAL-E to store it in S3, but you can just as easily have the replica scp it from the master on demand or whatever. The replica, whenever it is online, fetches WAL and replays it to catch up with the master. It can also remove WAL from the archive after successful replay if there's only one replica. (Otherwise deciding when to remove WAL is ... hard). The replica can run read-only queries, but nothing read/write. Two-way read/write If you want two-way disconnected sync, then I suggest you start with the chapter in database theory named "El Dorado", then continue reading into "Magic". Everybody wants this, and it does exist, but always with some difficult compromises. The biggest: how do you deal with conflicts where both modify the same record? How do you handle read-modify-write cycle inconsistencies when disconnected? You need a database plugin that has application specific merge logic, or to write your application very carefully so it can survive last-update-wins merge logic. If you're doing that, and really keen to try very experimental code, keep an eye on http://wiki.postgresql.org/wiki/BDR_User_Guide, an in-development two-way logical replicaiton feature for PostgreSQL. Otherwise, you may have some success with Slony-I or Bucardo, external replication tools for Pg. If at all possible, design you app not to require this, or have your app deal with the synchronization at a higher level using application specific logic, where you record changes (with triggers or with app logicl) and then replay them using your application's knowledge of what the data means.
Creating a table with two columns
SQL, Database Testing • postgresql table • • Mystic

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try using pgAdmin III an intuitive graphical interface for postgresql pgAdmin page
Create a SELECT to bring the difference of two tables
Software Programming • php sql • • briley

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To bring all biweeks that are not linked to any billboards, the select below does this:SELECT * FROM bisemanas bs WHERE NOT EXISTS (SELECT 1 FROM outdoor_bisemanas obs WHERE bs.id_bisemanas = obs.id_bisemanas); orSELECT * FROM bisemanas bs LEFT JOIN outdoor_bisemanas obs ON bs.id_bisemanas = obs.id_bisemanas WHERE obs.id_bisemanas IS NULL;
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Limited cycle conclusion
Software Programming • php mysql • • rosemadder

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The simple task, without the use of templates and finished components, can be solved as follows:$currentPage = 1; //текущая страница (CUR_PAGE) $maxPagesCount = 5; //общее количество страниц (num_pages) $paginatorHtmlContent = ''; //Переменная для хранения HTML кода паджинатора $minPage = max(1, $currentPage - 5); //Минимальная страница которую нужно вывести - 5 $maxPage = min($maxPagesCount, $currentPage + 5); //Максимальная страница от текущей + 5 for($i = $minPage;$i <= $maxPage;$i++) { if($maxPagesCount >= 1) { if($i === $currentPage) { $paginatorHtmlContent .= "<b>{$i}</b>"; } else { $paginatorHtmlContent .= "<a href='?page={$i}'>{$i}</a>"; } } } echo $paginatorHtmlContent; I want to make some recommendations on your code:Stop using mysql* expansion if this is a new project, move to more new PDO and mysqli libraries;Reject the content of the variables received from the user in the request to the database, since this approach is likely to be SQL injection;Name the variables in one style;Start dividing the applications, the user interface and the logic manager. For example, you can try some fraimvorc.
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Postgres reduce by key if key is not null
SQL, Database Testing • postgresql performance optimization index tuning postgresql performanc lan • • rielyn

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Assuming you want what your current query does (which seems different from what your description says). You ask: I think that problem is with filter but how to make it use index? Your query plan shows that Postgres is already using indexes for every step of the way. The added FILTER step only filters rows according to your additional predicates. I posted a different idea at first that was missing ORDER BY seq. This query using a simple NOT EXISTS anti-semi-join should be a better equivalent: SELECT user_id , seq , timestamp , reduce_key , mapping FROM user_sequence u WHERE user_id = 860862404 AND seq > 3562974 AND NOT EXISTS ( SELECT 1 FROM user_sequence WHERE user_id = u.user_id AND reduce_key = u.reduce_key AND seq > u.seq ) ORDER BY seq LIMIT 1000; Your existing indexes look good for it. The second one might be a bit more efficient with descending sort order for the last item: user_sequence_user_id_reduce_key_seq_idx btree (user_id, reduce_key, seq DESC) Normally, there would be a simpler alternative with DISTINCT ON, but that would fold all rows with reduce_key IS NULL into a single row while you want them all. Related answer with more explanation: How do I efficiently get "the most recent corresponding row"? Aside: You have a lot of unnecessary parentheses and double-quotes. Maybe an inefficient ORM?
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Incorrect conclusion
Software Programming • php html mysql jquery ajax • • juvenalb

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Do it.$output = ''; while(***){ $output .= '<option data-tokens="'.$row[0].'">'.$row[0].'</option>'; } echo $output; On the page<select id="result" name="result"></select> In js, just put on that list what came from the server. success:function(data) { $('#result').html(data); }

Consolidated conclusion without joining

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Sync offline PostgreSQL server
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Incorrect conclusion
Software Programming • php html mysql jquery ajax • • juvenalb