I am currently working on a project to build a database on professor’s research paper database. This is my first time building a database(never had experience with MYSQL) and I am learning as I am doing it. I was able to use an api to get the data, for example: {“authorId”: “1773022…
Tag: mysql
Boolean values are not mapping properly when using multiset in JOOQ
The ProductCategoryDto class : CategoryAttribute class : The query with needs to be executed is The output for the query is Database create statements: Code generation configuration in pom.xml: I am getting all the boolean fields as null while they are not null in Actual data. How to map the boolean fields pr…
SQL method for returning data from multiple tables based on column names
I am trying to do something a little weird and cannot figure out the right method for getting it done. Essentially I am trying to pull all tables/views and columns where the column name is like some string. In addition to that I would like to pull 1 row of data from that table/view and column combination. The…
MySQL : calculate SUM of a Query
i have a mysql query that looks like this : The query returns a table b : I want to do the sum of those values By but it doesn’t work because of a syntax error. is it possible to sum a query like this ? Thanks. Answer Try this:
Why does my SQL Statement not SUM() up correctly?
I have the following statement: note that = (1 or 4) refers to two statements in the database where 1 is sold and 4 is a refund. With = (1)) I get the following results: Costs – Unitamounts 3.281,10 – 582 With = (4)) I get the following results: Costs – Unitamounts -115,2 – -32 With = …
WITH queries with INSERT in MySQL
I’m trying to do something that I’m almost positive works in Postgresql: In other words, I want to grab the “something” row to be used for a bunch of new rows in “somwhere”. Each new entry should have a reference (like foreign key value) back to the same “something…
grouping equal values – aggregate function problem
I’ve created a table that lists venues in which several events take place. The same event in the same venue can have a different price. The last column calculates the total revenue for one venue. venue event totalprice sum Venue A Event A 5 30 Venue A Event A 10 30 Venue A Event B 5 30 Venue A Event
How can I count the number of items in inventory available on any given day?
I have a table that contains records for items that are available. Each of the records contains a field for the date it was added to the inventory, the date it was removed from inventory (otherwise NULL) and a unique serial number (separate from the primary key). There are also other fields giving metadata ab…
MySQL: LEFT JOIN TWO tables with preference for specific rows
Offshoot of this question: MySQL: LEFT JOIN table with preference for specific rows I have a Contacts table, a PhoneNumbers table, and a ContactPhoneNumber table. Additionally, I have a ContactAddress and Address tables. A Contact can haveMany PhoneNumbers via the ContactPhoneNumber pivot table and can also h…
How can I change the grammar in mysql?
in my query result However, if you search after changing the trdDtTm format, the results will not come out. How do I fix it? no items.. how to fix it? Answer trdDtTm is a datetime column. compares a datetime with a number hence. This makes hardly sense. Maybe you hope for the DBMS to magically match the two, …