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Query to retrieve recursively parent child nested list joining to another two tables MySQL-PHP
I've 3 tables and I want to joint them based on the following conditions. My first table is called components it has the main parent and it has a sub-component called sub_compnents which holders the c...
Girmangus Hailu
Votes: 0
Answers: 1
SEVERE: Exception loading sessions from persistent storage java.io.InvalidClassException: com.vaadin.server.VaadinServletRequest; no valid constructor
I created the war file of a web application and deployed on tomcat and started the tomcat server.
server is started successfully but I can see below exception in catalina.out file.
SEVERE: Exception l...
RKM
Votes: 0
Answers: 0
How to store status of rows in MySQL according formalization rules?
I have a table order_executors:
id | order_id | user_id | status
Where order_id and user_id are external keys.
The status columns means the state if row. It accepts 0, 1, 2:
0 - default
1 - accepted
...
user15444752
Votes: 0
Answers: 2
Which normalization rule does this table violate?
I have a table executors with columns:
id(pk) | order_id | executor_id(ek) | execution_price | created_at | selected
1 1 200 1893883332 NULL
So, this table cont...
user15444752
Votes: 0
Answers: 1