I have the following table which you can also find in the SQL fiddle here: I use the following query: All this works fine so far. Event_01 only has a CampaignID. Event_02 and Event_03 have a CampaignID and Products. Now I want that if I select Product B in the query the corresponding values on CampaignID leve…
Tag: mysql
Pagination does not display the last two data from the database
This is where I set the number of pages and starting point: This is where the looping and the buttons: Total Records: 8 Total Pages: 4 But then it only prints 3 buttons, kinda confused where did I go wrong. Answer my guess is you’re starting from 1 instead of 0 or use instead
How to search JSON array field in MySQL?
I have a column which has json type arrays like How can i use where clause to find “abc” contained rows? My json arrays has no key. They only have values. returns 0 rows Answer You can use MySQL JSON search function JSON_CONTAINS():
Set MySQL timestamp to random time within past 24 hours
I have a timestamp column in my MySQL table. I’m wanting to set this timestamp to a random time within the past 24 hours for all rows in the table. I know I can update all the rows doing this: …
Select data from specific row of grouped and joined table in MySQL
I have two tables, customers and orders which are inner joined. A customer can have several orders associated with them. In my selection, I then group by customers.id. I need to select the most recent …
How to read double signups for a class in two separate databases without subqueries? SQL
I am using MySQL for an intro to databases course. We are currently practicing using aggregations and joins to create new relevant columns. I have a class table that contains information about classes such as the class id, name, code, etc. I also have a ClassStudent table that shows all students that are sign…
How can I check if the time is more than an hour later?
So I have a database entry that update the date/time in yyyy-mm-dd hh:mm:ss. Now I want to check, if there is a space inbetween the the database and the actual time from 60 minutes. How can I do that? Example: Answer You can use something like this:
MySQL: get total number of employees in each department
I am new to MySQL and Have following question. Let’s say I have two following tables Departments DepartmentId Name Employees ID DepartmentId Name I have written following query which is …
How to get the value using another column and get difference between each row in MySQL or SQL?
finish_position official_rating date Difference 11 NULL 2013-09-18 0.00 4 NULL 2013-11-08 …
i am trying to create foreign keys but i got error 1822 .. please see my code below
CREATE TABLE employee( empid int auto_increment primary key, empfirstname varchar(200) not null, emplastname varchar(200) not null, email varchar(200) not null, officenumber int not null ); …