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am using query as
Select machine_id as MachineID,item_name as Name,SUM(item_quantity) as Quantity,SUM(billed_amount) as BilledAmount,SUM(received_amount) as ReceivedAmount from transaction where DATE(paid_date)='" + rdate + "'Group by machine_id,item_name
Sure, craft a select query either as a stored procedure or a string query (remember to use parameters), make a connection to the database, and either execute your query string orthe stored procedure. Bind the results to your display control.
Just what are you expecting as an answer to a request for suggestions?
Never underestimate the power of human stupidity
dear i have two tables one is student and second is subject. the student is having columns: id(primary key), roll, name. and the subject table is having columns: id(primary key), idfk(foreign key), name.
The problem is that which i wrote query in my code it is fully correct because the student table is being update, but the subject table is not being update due to foreign key of the student which is idfk.
So my question is that. which query should i write in my jsp code, which when execute and it should update the table without any error.
dear friend i am using mysql and oracle. would you create the tables and send me their code here. Please because i am searching this problem solution from last 3 months. Please i humbly request you help me.
Creating a foreign key is required for refrential integrity and is normally a good practice. It is also true that a foreign key has a say inperformance. To make it better what you can do is to create index on the foreign keys.
As I mentioned creating a foreign key constraint is required for refrential integrety and normally is a good practice. It do have an impact on performance which can be reduced by creating an index. If you craete the index on foreign key it will reduce the lookups.
Creating a foreign key is not mandatory but is advised to create. Here[^] is a link which tells about the importance of it.
Now here[^] is another article which tells about refrential integrity and performance degradation which might give you a bit more idea about this.