In a mysql database (ver.5.7.15) I’ve got the following table named operation_list containing the following data: id (autoincrement integer, primary key), operation_date_time (datetime), operation (…
Tag: mysql
Multiple joins on same table
I’m trying to achieve a query which seems simple but I can’t make it work correctly. Here’s my database tables structures: Here’s what i want to achieve: Mutliple members can register to an activity. Then, i group the registrations by tandems. I want a view with all the tandems listed …
Is there a way I can get output of count values in MySql?
I am dealing with getting the output of some common values. My database is quite big so I am just giving a dummy database here for understanding purposes. Here is the table I have: I have to extract only those variables that have the given common room numbers alotted. This is the table for the required data: …
MySql Trigger for notification
In a table in MySql database, I have a boolean column with ‘Yes’ and ‘No’ for appointment confirmation. As soon as appointment gets ‘Yes’, a notification is sent via an AWS Lambda call. I want to send a 12 hour prior notification before the day of the appointment. What is t…
How can I secure this sql query from SQL Injection in Laravel?
I am trying to create restAPI in Laravel. How can I secure an SQL query like this from sql injection? Answer Laravel’s database query builder provides a convenient, fluent interface to creating and running database queries. It can be used to perform most database operations in your application and works…
SQL error ‘ER_OPERAND_COLUMNS: Operand should contain 1 column(s)’ for DELETE function
Trying to delete rows that exist in both temp_abstract table and abstract table. When I just run what’s inside the parentheses it returns what I want, but adding a delete from where seems to throw this error. Any help? Answer You can use EXISTS instead : Sub-query will return only one expression while u…
SQL Getting the party with highest votes
I am trying to make a voting system through a SQL server, and I can’t get it right. What I am trying to do is get the party with the highest amount of votes. I expect something like [DEMS][8], or at the very least, the party name of the party with the highest votes. Answer Rather than using a WHERE
Is there a way to also select the row count from the same following query?
Would I be able to add a rowcount to this same query or would I need to create a separate one? Answer You can do it with a cte
Query for similar phrases
Is there any way to match ‘United States of America’ with ‘United States’ in SQL? I have the country with the name ‘United States’ stored in the database. The query below should retrieve the item from the database with the name ‘United States’. Thank you! Answer…
How to find every genre from an artist in a music database in MYSQL?
So I’ve got a database with 4 tables: artist, genre, track and album. Track table points in a many to one way to Genre table, and so on with Track to Album, and Album to Artist. Suppose I want to find every genre that ‘John Coltrane’ plays, so I thought about saying But this just gives me i.…