I am currently working with a MySQL database table structure. I found a great table structure online but i am not sure how to duplicate such thing. I am new to this and I am requesting help in creating a query that will create all tables( which have correlated data(index), foreign keys, many to many relationships, etc.).
Random I was able to make a query to select all fields:
SELECT *
FROM schedule
INNER JOIN semester
ON schedule.semester_id = semester.id
INNER JOIN office_hours
ON office_hours.schedule_id = schedule.semester_id
INNER JOIN faculty
ON faculty.id = office_hours.faculty_id
INNER JOIN faculty_titles
ON faculty_titles.faculty_id = faculty.id
INNER JOIN faculty_education
ON faculty_education.faculty_id = faculty.id
INNER JOIN section
ON section.faculty_id = faculty.id
INNER JOIN class
ON class.id = section.class_id
INNER JOIN major_class_br
You find a good documentation of how to create tables in the corresponding MySQL documentation:
MySQL 5.0
MySQL 5.1
MySQL 5.5
You can user MySQL Workbench if you want to play a little with a graphical front-end. You can download it from the link or install it from you Linux repository.
There are three section in the workbench: SQL Development, Data Modeling, and Server Administration. Choose "Create new EER Model" in the Data Modeling section and then "Add Diagramm". You can insert new Tables by drag and drop from the left bar and apply your model to your database by clicking on the Database menu entry and then "Forward Engineer...".
The table structure you linked in you querstion was created by MySQL Workbench as well. Therefore, it should be easy for you to compare it.
Related
How to remove all the reminders belonging to the news created by Jack?
These are tables created by me with same data and now I want to fire SQL query for above requirement.
This is what I tried
DELETE FROM reminders
USING news
INNER JOIN reminders
WHERE CreatedBy = 'Jack'
AND reminders.ReminderId = news.NewsId;
I find the USING syntax in MySQL deletes to be a bit confusing -- because USING is already used syntactically as a replacement for ON.
Something like this should work:
DELETE r
FROM reminders r JOIN
news n
USING (NewsId)
WHERE n.CreatedBy = 'Jack';
Note that the join condition is on NewsId in both tables.
How does one join two tables that are in different databases using the SQL runner in MySQL Workbench?
I have searched for this and explored the interface but could not a find a solution.
If it is not possible with Workbench, is it possible with another client?
Note: the databases exist under different connections and ports!
You can simply join the table of different database. You need to specify the database name in your FROM clause. To make it shorter, add an ALIAS on it,
SELECT a.*, -- this will display all columns of dba.`UserName`
b.`Message`
FROM dba.`UserName` a -- or LEFT JOIN to show all rows whether it exists or not
INNER JOIN dbB.`PrivateMessage` b
ON a.`username` = b.`username`
So just adding DB name before tablename will solve your problem.
In that Case you can use,FEDERATED Storage Engine to join two mysql connections running on two servers.Please refer doc to know more about it
http://dev.mysql.com/doc/refman/5.0/en/federated-storage-engine.html
I have 3 tables called
_partnership,
_partners,
_partnership_arm._partners = stores basic partner information
_partnership_arm = stores partnership arm details
_partnership = stores partners partnership records which includes the partner_id
arm_id which reference _partners.partner_id and _partnership_arm.arm_id.
So as an admin i want to select all details from the _partnership table which join other table reference without a where clause, but am having issue doing it.
here is my code
SELECT
_partnership.*,
_partners.names,
_partnership_arm.arm_name
FROM
`_partnership`
JOIN
`_partners`,`_partnership_arm` ON
_partnership.partner_id = _partners.partner_id
AND
_partnership.arm_id = _partnership_arm.arm_id
I also want a user to be able to select using a where clause
Please how can i achieve this?
Thank you.
SELECT
_partnership.*,
_partners.names,
_partnership_arm.arm_name
FROM
`_partnership`
JOIN
`_partners` ON _partnership.partner_id = _partners.partner_id
JOIN
`_partnership_arm` ON _partnership.arm_id = _partnership_arm.arm_id
I'm having an issue with a mysql query for a search screen at work. I've got the query working using the code I'll post below, but I'm suspicious there is a better way to do it. Mysql are pretty newbie really, I just figure it out as I go along, or try to.
Here is the concept of the database:
There is an Entity, Address, Contact, Client, Group and Facility table involved in my query.
Each Client, Group and Facility is an "Entity" for lack of a better word. Each Entity has it's own Entity ID in the Entity table.
The Entity table houses an address record id and a contact record id.
On the facility search screen, if a user searches a phone number I want to search through the client and group records as well as the facility records. And then return any matching facility information as I normally would.
Here's what I've got so far(I'm doing nothing for address outside of facility records just yet and I've hardcoded some things for the sake of explaining myself):
SELECT facility.FacilityID, facility.Name, contact.PhoneNumber, addy.State addy.ZipCode, facility.ProductionFacilityID,
facility.ProductionEntityID
FROM Facility facility
INNER JOIN ClientGroup cg ON facility.GroupID = cg.GroupID
INNER JOIN Client c ON cg.ClientID = c.ClientID
INNER JOIN Entity e ON facility.FacilityID = e.EntityID
INNER JOIN Entity eg ON cg.GroupID = eg.EntityID
INNER JOIN Entity ec ON c.ClientID = ec.EntityID
INNER JOIN Contact contact ON e.BillingContactID = contact.ContactID
INNER JOIN Contact contactg ON eg.BillingContactID = contactg.ContactID
INNER JOIN Contact cc ON ec.BillingContactID = cc.ContactID
INNER JOIN Address addy ON addy.AddressID = e.PhysicalAddressID
WHERE (facility.FacilityID like '%$searchfor%'
OR contactg.PhoneNumber like '%$searchfor%'
OR cc.PhoneNumber like '%$searchfor%')
AND facility.IsRowActive=1
ORDER BY $searchtype";
Thanks in advance for the help!
Yes, the better way to do this for maintenance purposes is to create a view of only the inner joins and querying the view. Remember in terms of performance there would be little by way of improvement but maintenance of the code would become much easier.
Given your purpose the inner joins are not entirely avoidable unless you decide to change the structure of the tables
I am migrating a news aggregation WP site to a commercial service. We currently have over 14,000 posts on it.
We want to save the current database and reuse it under a different domain name for historical purposes.
Once we move to the new site we want to trim the WP database of all posts and related tables that are older than 01.01.2013
I know how to do a simple select where delete query.
But WP forum mods have told me that I should do an inner-join on the following tables to ensure I get everything cleaned up:
wp_postmeta
wp_term_relationships
wp_comments
wp_commentmeta
I am not familiar with inner-join. Can someone help me with this?
Not completely understanding the table structures involved, an INNER JOIN will join one table to another and return the records that match based on a certain criteria (usually joining two fields together such as a primary key and a foreign key).
To delete records from one table where some or all are in another table, the following syntax would be used:
DELETE TableName
FROM TableName
INNER JOIN AnotherTable ON TableName.id = AnotherTable.id
Here's a good visual representation of JOINS.