It's been so long since I did any Mysql queries I forgot how to do basic joins. I have two tables:
Orders_ and
Members
I need to create one view which displays all the orders with the associated Email and Member_Id.
http://i.imgur.com/7ttXtrk.png <-- Tables
The query, based on your image, should look like so:
SELECT Orders.*, Members.*
FROM Orders
INNER JOIN Members ON Orders.coordinateList_Id = Members.Members_Member`
I would refer to the MySQL reference
SELECT *
FROM Orders
INNER JOIN Members
ON Orders.coordinateList_Id = Members.Members_Member
Related
Is there a way to join four data tables depend on date in order to view all patient details? Below are my tables with columns:
registration
(re_id,firstname,lastname,phone)
patientnotes
(paid,notes,re_id,tarehe)
laboratory
(labid,investigations,re_id,tarehe)
result
(rid,result,re_id,tarehe)
Yes, you can join as many tables as you want. It looks like the common id between all your tables is the re_id, so use that to join across all records into a single row, and select the columns you want in the resulting table.
SELECT *
FROM registration
INNER JOIN patientnotes ON patientnotes.re_id = registration.re_id
INNER JOIN laboratory ON laboratory.re_id = registration.re_id
INNER JOIN result ON result.re_id = registration.re_id
I have two tables:- PERSON and DATA. What I want to do is fetch all details from PERSON table and only two columns from DATA table only when PERSON.personId = DATA.personId.
I am using this query:-
SELECT *
FROM PERSON AND SELECT DATA.value, DATA.field
FROM DATA where PERSON.personId = DATA.personId;
But I think this is wrong syntax. Can anyone tell me what is the right syntax for it.
SELECT p.*,d.column1,d.column2
FROM Person p
JOIN Data d
ON p.personId = d.personId
WHERE <Condition>
In this query person with all columns and data with your desire column you can fetch by this query.
Something like this:
select
P.*,
D.value,
D.field
from Person P
join Data D on P.PersonID = D.PersonID
change P.* to the specific columns that you need but P.* will get everything from the Person table.
check this post out LEFT JOIN vs. LEFT OUTER JOIN in SQL Server to learn about JOINS, the diagram is good to understand what the different ones do
Its really easy, Just execute this query:
SELECT
PERSON.*,
DATA.value,
DATA.field
FROM
PERSON INNER JOIN DATA USING (`personId`);
It selects all fields of PERSON + value and field from DATA.
Also it uses personId to join the two tables.
Fill free to ask if you need more info.
You can use join (LEFT JOIN)
SELECT * FROM PERSON LEFT JOIN DATA ON PERSON.personId = DATA.personId
Hope it will help you
Here's the correct syntax for achieving what you've asked for:
SELECT PERSON.column1,PERSON.column2,PERSON.columnN,DATA.value
FROM PERSON
INNER JOIN DATA
ON PERSON.personId = DATA.personId
Line#1: lists the columns that you want to select with references to their parent tables.
Line#2 and 3: are the two tables that you want to select from and join with
Line#4: is the join condition between the two tables (with matching IDs or other information)
I have 3 tables :
Users, which contains relevant user data
ComputerUsers, which ties together Users with information from a fourth (and for my purposes here irrelevant) table, Computers.
And finally, Software, which contains a list of software present on various computers.
The only thing tying a user together with a piece of software is
Users.User_ID <-> ComputerUsers.User_ID/ComputerUsers.Computer_ID<->Software.Computer_ID
I know that I can use
SELECT * FROM Users INNER JOIN ComputerUsers ON Users.User_ID = ComputerUsers.User_ID INNER JOIN Software ON ComputerUsers.Computer_ID = Software.Computer_ID
to tie together the user with all of their software, especially if I filter it like
Where Users.User_ID = 'Some_Value'
My gripe is that when I run this SQL, I get a result set that contains :
All of the columns from the Users table, both columns from the Computer_Users table, and all columns from the software table.
I'm sure there's a better way to do this but I'm a rookie with MySQL, SQL, and database stuff in general.
How would I go about accomplishing joining together the Users table with the Software table while omitting the columns from the Computer_Users table?
You can do this to get columns from just two tables:
SELECT u.*, s.*
FROM Users u INNER JOIN
ComputerUsers cu
ON u.User_ID = cu.User_ID INNER JOIN
Software s
ON cu.Computer_ID = s.Computer_ID;
A cleverer way is to use the using clause:
SELECT *
FROM Users u INNER JOIN
ComputerUsers cu
USING (User_ID) INNER JOIN
Software s
USING (Computer_ID);
Columns used for the join conditions do not get repeated when you use USING.
You need to list the columns you want in the SELECT portion of the query, rather than using *. You can do this by table:
SELECT Users.*, Software.*
FROM ...
Or by column:
SELECT Users.UserName, Users.Login, Software.Title, Software.Version ...
FROM ...
I have two tables and they are as follows:
USERS
ORDERS
I want select all users who have at least 1 order or more in the ORDERS table. I know there is an inline query for this in MySQL, but right now I have to select all users and then make another query seeing if each user has an order - all this using a PHP loop.
What I am doing now is not ethically correct, so I basically just want to select all users who have been referenced in the ORDERS table in ONE MySQL query.
This is a query you should be using
select distinct u.* from users u
inner join orders o on o.user_id = u.id;
Note the distinct and u.*. This query will not select fields from orders and it will not select the same user twice (if one has more than one order).
Demo: http://sqlfiddle.com/#!2/6ebcc/3
You can use mysql join syntax. Assuming both of your tables has userid column, this is the example :
SELECT * FROM USERS a JOIN ORDERS b ON
a.UserId = b.UserId
This is a simple database operation, see here for the explanation join
I have to get data from two SQL tables but I am unsure of what join to use and the same tables have the same customers_id table would I use an inner join?
table - customers
customers_id
customers_firstname
customers_lastname
customers_email_address
table - orders
customers_id
customers_street_address
customers_suburb
customers_city
customers_postcode
customers_state
customers_country
It depends on what results you want. If you want every record in Customers regardless of whether there is a matching record in orders the you would use an LEFT OUTER JOIN. If not you would use an INNER JOIN. This is the article I typically refer people to for a basic explanation of joins.
An INNER JOIN would look like this:
SELECT c.customers_id,
c.customers_firstname,
c.customers_lastname,
o.customers_street_address,
o.customers_city,
o.customers_postcode,
o.customers_state
FROM customers as c
INNER JOIN orders as o
ON c.customers_id = o.customers_id
I purposely did not do select *. Try to get into the habit of only selecting the columns you want from tables instead of everything.
The join you should use depends on which information you are trying to retain, based on the customer ID. If you're looking to retain all of the information from customers even if there is no match with orders you would use a left join. Conversely, if you wanted to retain all the information from orders even if there were no match with customers you would use a right join.
If you want to return all of the information, and combine rows which have a match, use a full join. Finally, you can use an inner join if you only want the rows which have a match from either table.
the same tables have the same customers_id table
I think you meant to say they have a common column, being customers_id, in which case you can use NATURAL JOIN.
INNER JOIN Ya you can use it.
You can write below query to get your all data from two tables.I am going to write full join query for you.y
select customers.customers_firstname,
customers.customer_lastname,
orders.customers_city
from customers
INNER JOIN orders
ON customer.customers_id = orders.customers_id