An SQL join clause combines records from two or more tables or views.

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4
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3answers
104 views

MySQL JOIN query produces wrong result

I have two tables complaints and complaints_reply in my MySQl database. Users can add complaints which are stored in complaints the complaints reply are stored in complaints_reply table. I am trying ...
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0answers
44 views

How to display all the dates between multiple two dates in a table?

I want to display all the dates between two dates for a particular record And this is the table : ID Start_Date End_Date 1 2013-01-14 2013-01-18 2 2013-02-01 2013-02-04 and now i want to get all ...
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2answers
152 views

Calculating percentage from two tables

I have two tables: First one contains unique mentees under one mentor, so mentors can have more than one mentee in that table. Second one contains interactions of mentors with mentees on different ...
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1answer
149 views

How to optimize a query so that it seeks on one index first, and then another index after that

I have two sets of earth measurements from satellite data, each with time fields (mjd for mean julian date) and geography positions (GeoPoint, spacial) and I'm looking for coincidences between the two ...
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1answer
3k views

UPDATE a column by COUNT of another table

It might be a naive question, but what is the difference of these two queries and which is preferred? UPDATE table1, (SELECT id,COUNT(*) idcount FROM table2 GROUP BY id) AS B SET table1.Freq = ...
2
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1answer
48 views

Join more than 3 tables in one single query, with many comparisons and no IDs

I use an overlycomplex and poorly designed software at my work, and now I need to produce a report of invoices issued between a period of time. Invoices are held at table ENTR2012, which uses the ...
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1answer
41 views

INTERSECT query rewrite as JOIN?

I have two queries written in PHP against a Microsoft SQL Server database (I know this is weird). I'm querying one table. I want the records shared by both results sets ONLY. Here is query #1: ...
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1answer
183 views

Query with group by having count 0

I am working on application for managing football league as my homework. I want filter list of players by number of matches they have played in league. For example user can enter count > 0 and count ...
4
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6answers
1k views

How to find the nth highest salary in SQL?

I have found a query to find the nth highest salary from Employee table , but i don't understand the logic of (N-1)? EmpID Salary 1 90000 2 80000 3 54000 4 ...
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0answers
32 views

How to improve performance when joining against coalesce

In an effort to remove a caching layer from our application, I'm building a number of views to encapsulate the different ways a user can have access to a piece of content - one per "rule" of access. ...
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1answer
78 views

Selecting most recent date when dates are stored in another table

Working in a MySQL database, I have tables set up like this: Table song_instances has song_id (int), meeting_instance_id (int) The meeting_instances table has columns meeting_instance_id (int), ...
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1answer
46 views

Retrieve multiple rows from table2 based on single row from table1 in SQL Server [duplicate]

I have two tables and I am using SQL Server. table1 structure is Campiagn_Id Campiagn_Name 1 test1 2 test2 3 test3 and table2 structure is Campign_Id EmalList ...
0
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1answer
27 views

How to join tables without identifiers?

For school I have to do this: Query what salary scale an employee belongs to displaying these collumns: s_schaal.schaal, werknemer.name, werknemer.salaris. But there are no identifiers between the ...
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2answers
258 views

Join two tables and return data and count in a single query

I have two tables in an SQL Server database, one with two columns and one with four: tbl_email_list email_list_id int (PK) email_list_name varchar tbl_email-details email_uniq_id int (PK) ...
0
votes
1answer
80 views

Inner join on array column in Postgres

In Postgres 9.4, I'm trying to pull the names of all columns that are involved in a UNIQUE constraint for a given table in Postgres. It looks like the names of such columns are contained in ...
0
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2answers
59 views

inner join select - group by?

I have 2 tables (Oracle database): ANEXA2A_TABEL1: id fk_id_anexa pet1 pet2 alt1 alt2 1 123 10 1 20 2 2 321 11 2 10 3 ...
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1answer
24 views

making a where clause optional in a sql statement

Here is my current query: `SELECT `performers`.`hash`, `performers`.`alias`, `performers`.`date_updated`, `performers`.`status`, IF(`performers`.`status` = 'active', 'deleted','active') AS ...
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2answers
148 views

Interpretation of multiple join order

I have a problem using multiple joins in one SQL Statement. For example, I have 10 Tables which are tbl1, tbl2, tbl3,..,tbl10. I would like to select some columns from each table. If I use joins in ...
3
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2answers
721 views

PostgreSQL joining using JSONB

I have this SQL: CREATE TABLE test(id SERIAL PRIMARY KEY, data JSONB); INSERT INTO test(data) VALUES('{"parent":null,"children":[2,3]}'); INSERT INTO test(data) ...
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0answers
12 views

How to calculate sum of a column in a table accessed with multiple joins and where condition

I am unable to find correct sum of vaccinated based on campaign id. no matter which campaign I choose to get sum of vaccinated on the basis of that campaign id it always returns the same data. Please ...
2
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1answer
83 views

Oracle 11g hash join vs nested loops question

I'm using Oracle 11g and working on a legacy system. I have two tables, A and B. A has ~40M rows and B ~4M rows. A has a foreign key on B (B is the parent of A). A query does essentially this: ...
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0answers
28 views

How to display additional column in select with true/false value [SOLVED]

Solved. Look in comment. I am using PostgreSQL 9.1. I have 3 tables: simcards: id serial NOT NULL, iccid character varying(30) NOT NULL, customer_id integer customer: id serial NOT NULL, name ...
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1answer
34 views

Meaning of JOINs in sql

I was trying to interpret the relationship between JOINs like LEFT-OUTER JOIN, RIGHT-OUTER JOIN, etc with relationships like Many-To-Many, One-To-Many etc in Hibernate or database language.
3
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1answer
7k views

how to fetch different data on compare rows of two tables

I have two tables in my database, one is user_app table in which user info are stored, table are as: +--------------+--------------+------+-----+-------------------+-----------------------------+ | ...
0
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1answer
87 views

Is it possible to simplify a query with multiple joins to the same table?

I have a rather large query which takes longer to run than I would like because of 17 LEFT JOINs on the same table. I've done some searching, but haven't found anything that is really similar to my ...
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1answer
280 views

Left outer join not returning all rows in a grouping query

I'm trying to query all users to find the price of orders in the last month. I'm doing this on PostgreSQL. Here's a toy database to show my problem: I have a people table and an orders table. I'm ...
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2answers
146 views

Is there a way I can speed up queries against this particular view?

I have three tables in a PostgreSQL database that I'm querying via a view and some joins. CREATE TABLE network_info ( network CIDR NOT NULL, some_info TEXT NULL, ...
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0answers
28 views

Performance hits with MySQL Left Joins and Order By

There are a lot of questions out there regarding this issue, but most answers seem to be very case-specific. I've tried to make this general so it'll help others too. The Issue We have a smallish ...
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1answer
24 views

Table for actual values

I have a database where logging happens and is processed in a data-warehouse styled environment. This means there are staging cycles where the data comes in and then is processed. For a reporting ...
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1answer
64 views

How to join SQL tables where value is Between min and max value

I am currently looking to join two tables together based on an IP and IP range. Both the IP and Range are currently stored as BIGINT. For example we have a table MasterData with IPs in integer ...
2
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1answer
36 views

Converting a GraphDB schema to a relational database schema

I currently am using a graph database and am considering moving off of it to a relational database like Postgresql. My concern is that I have lots of relationships between entities (since this is ...
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0answers
13 views

creating best results from two tables

I have two tables, one is the results of an assessment from users(per row) and column starting with 819....X1 represents the qid. The other table holds the score for the answers (A1,A2,A3), both are ...
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2answers
121 views

Inner Join and Right Join same query

I'm using MySQL and InnoDB, I have a table reserver with 2 columns : idReservation and idChambre I have a table reservation and a table chambre Now I want my query to return every "chambre.id" who is ...
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2answers
34 views

MySQL - Creating an associative table

I have the following table structures: Cases: (PK) case_id | case_notes | time 1 | blah | timestamp 2 | blah | timestamp 3 | blah | timestamp . | . ...
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0answers
22 views

How to get records in group when records are duplicated?

I have following table structure. Here id is primary key and auto incremented.Here Records are duplicated and id with 1 is parent records and id with 2 & 3 are its child records. same with id ...
3
votes
1answer
97 views

Optimizing Join between a very small and a very large table

I have two tables: CREATE TABLE `TBL_REPORT` ( `ID_TBL_REPORT` bigint(20) NOT NULL AUTO_INCREMENT, `INDEX_NAME` varchar(100) NOT NULL, `INDEX_VALUE` varchar(100) NOT NULL, ...
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1answer
46 views

Query data from two tables and substitute foreign keys of first table with values of second [closed]

There is data table mysql> select * from data; +----+--------------------------------------+ | id | uid | +----+--------------------------------------+ | 1 | ...
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0answers
27 views

Subquery optimization

I was reading through this article - http://explainextended.com/2009/09/18/not-in-vs-not-exists-vs-left-join-is-null-mysql/ I am working with an existing design. What I want is to be able to select ...
0
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1answer
88 views

LEFT JOIN DEFAULT NULL VALUE

I had query simplified like this : SELECT a.id, a.name, b.* FROM a LEFT JOIN b ON a.id=b.id Which b is from group concat select (very dynamic column). Sometime there are 3 column in b, sometime ...
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0answers
41 views

Join two tables and count a column using mdx

I am trying to join the two tables as below Table1 --------------------------- Product| StoreType| Store --------------------------- 1 | 10 | X ...
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1answer
31 views

placing conditions in a join query join on vs where

Is there and advantage to one of the following options over the other or are they the same ? select * from T1 Join T2 on T2.id=T1.t2_id and T2.field=value; vs. select * from T1 Join T2 ...
0
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1answer
78 views

Select max value from many to many tables

i have next tables in may data base: I want to select the book that has the max number of pages for each author. I did this : select auteur.nomauteur, auteur.prenomauteur ,livre.Title, ...
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2answers
73 views

Counting unique records across 2 columns and computing a score based on boolean values

I have a table that looks like this in Google Big Query: custID InteractionDate Purchased? Sales 1 20150312 F 0 1 20150312 T 200 1 20150314 ...
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1answer
26 views

Uniq join 3 tables with relationship table not uniq

I am using Postgres. I have 3 tables: table_1 id table_1_2 table_1_id, table_2_id table_2 id The problem is the relationship table table_1_2 is not uniq. I.e., table_1_2 will have the ...
0
votes
1answer
52 views

Creating Database Tables for Reviews functionality that incorporates Tags/Categories

I'm wanting to create some simple website functionality through a little database idea I have in order to give myself the ability to create/retrieve customer reviews based upon tags/categories. More ...
2
votes
1answer
2k views

MySQL: Which join is better between left outer join and inner join

Which join is better peforming if all of them provides the same result? For example, I have a two tables employees(emp_id,name, address, designation, age, sex) and work_log(emp_id,date,hours_wored). ...
0
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1answer
84 views

Select on multiple tables with group by

Using Postgres 9.3, I have problem with a select over few tables. I have simcards stock and I would like to get something like this: | network | supplier | total topups (EUR) | 1st topup qty| | ...
2
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1answer
120 views

Better way to select from nested tables in PostgreSQL

I have the following schema with millions of rows in the match table and each match have two sides (away and home). I want to create a view which shows the most significant data regarding the matches ...
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0answers
48 views

MySQL - Group By - How does it determine which row to return from joined table

I am getting desired, but inexplicable behavior on a particular query, and wanted to get more information before pushing up. I have 3 tables: foo bar bar_image And paring back all distractors, ...
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0answers
38 views

Poor performance filtering mysql spatial join

First of all, sorry for the crossposting. I ask this question in stackoverflow and they sent me here I have a mysql table with spatial references (GEOGRAPHIC_FILTER), like cities, countries, natural ...