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

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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 ...
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26 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
154 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
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1answer
23 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 ...
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2answers
41 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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How do I join these queries into one query? [closed]

I have these below queries. How do I join these 3 queries into a single query? 1st query: SELECT TOP(1) @tmpOnlineCat = ac.AlertCatID FROM alert.AlertCategory ac WHERE ac.FkAlertID = 2 AND ...
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1answer
19 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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22 views

Add one column from another table [closed]

I have query which works fine, but I wanted to Add one column from another table. Here is my query:- select Id,username,email,usertype,active,(CASE WHEN usertype='1' THEN 'Admin' WHEN usertype='0' ...
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6 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
29 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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16 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
30 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.
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AWA RDBMS dealing with large database [closed]

I am working on an application whose database is around 200GB. I am using MySQL with PHP. When I use the GROUP BY in a join query the response takes a very long time - approx 40 minutes. I can not ...
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0answers
19 views

Postgresql Query equivalent to VLookUp of Excel [migrated]

I have two tables such as Table1 and Table2. Table1 contains three columns called name, age and marks where marks column is empty and I need to populate from Table2. Table2 contains two column called ...
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20 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
22 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 ...
1
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1answer
52 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
24 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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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
27 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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2answers
99 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 ...
0
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1answer
74 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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19 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
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1answer
70 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
20 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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23 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 ...
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1answer
25 views

Select range of non-identical date from different table

On MySQL5 with innoDB, I have sensor data in multiple tables, all with an ID and a DATETIME field, like so (two tables shown, but there are more). The IDs and DATETIMEs are not identical between ...
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1answer
43 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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20 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
32 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
42 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
19 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 ...
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1answer
23 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 ...
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1answer
27 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 ...
0
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1answer
51 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| | ...
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32 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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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 ...
2
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1answer
53 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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2answers
59 views

Join 2 columns in one table based on equal values in a third column

I am trying to separate data within one column based on identical values in a second column. Our goal I to find out how many times each MD used a facility. Unfortunately, the table has separate ...
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2answers
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Adding counts inside a COALESCE

So I have a continuation of this question. New requirements have thrown in a third table. So here's the breakdown of how the tables relate: TabA(TabA_id, desc) TabB(TabB_id, TabA_id) TabC(TabC_id, ...
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1answer
31 views

Need help rectifying IN/NOT IN clause

Hi there everyone! I have built a link/content sharing site. The way it works is that each link can have multiple categories assigned to it. A video of a motorcycle race might have motorcycle, ...
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2answers
68 views

Join multiple Tables by date

i got some problems on my approach to join a couple of tables by a date range. This are my tables: RETURNS: RETURN_DATE RETURN_AMOUNT 02.05.14 2 02.05.14 3 02.05.14 1 ...
0
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1answer
16 views

Adding a column to aggregated data where new value only applies to a subset of the aggregation

Having trouble explaining this. I have a table like this: Label | Value A | 3 B | 1 C | 4 And another like this: Label | Value | ID A | 1 | ID1 A | 1 | ID2 C ...
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1answer
101 views

How to put the results of a query into a variable?

I have written a Postgres anonymous block. In which I have written join query on multiple tables like: select a.portal.*, a.p_fb_config.*, a.p_gplus_config from a.portal left outer join ...
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2answers
40 views

Is it a better idea (performance is key) to store in a normalized table and retrieve by JOIN or in a single nvarchar column and retrieve using LIKE?

NOTE: The application is not really about websites or keywords, I am using that here only to provide reference points for discussion. I have a data set that is really just a string of words. Think of ...
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2answers
100 views

Query to return zero if nothing exist

I have a table With currency, paymenttype and invoiceamount. I have to write a query to get currency, paymenttype and total invoiceamount made. This is pretty simple with group by. But actually I ...
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1answer
40 views

How to split a multivalued column, do a lookup and update another column?

This is a part of my previous question. How can I achieve the following for all the records in my table using a single query? SET @TeamMembers = TeamMembers from tblProjects where ID = '125' ...
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How to get list of ids from joining two tables (one to many) whose results is not present in a list?

Say Table 1: tID, tName Table 3: t2ID, tID, tSubjects One tID can be have multiple t2ID. What I want is list of tIDs who's t2IDs should not just have a list of t2IDs (1,5,6). i.e They can 1,2,5,6 ...
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81 views

Limit relation one to many or one to one

In a relationship one to many or one to one you can limit the relationship of the related table? For example, I have a table 'cliente' and another 'acct', each 'cliente' can have thousands (perhaps ...
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1answer
30 views

Mysql query giving incorrect values [closed]

When this SQL query is executed it gives incorrect value, please advise select sum(cash_management.cash_in), sum(cash_management.cash_out), sum(cash_management.pay_in), ...