SQL Interview Questions:4

4. Given a table of bank deposits and withdrawals, return the final balance for each account.

Assumption:

All the transactions performed for each account are present in the table; no transactions are missing.

create table transactions

(

transaction_id int,

account_id int,

transaction_type varchar(200),

amount decimal

)

insert into transactions values (123,101,'deposit',10.00),(124,101,'deposit',20.00),(125,101,'withdrawl',5.00),(126,201,'deposit',20.00),(128,201,'withdrawl',10.00)

                                                   


select * from transactions

select account_id,sum( case when transaction_type='deposit' then +amount else -amount end )as final_balance  from transactions group by account_id


                                           




Comments

Post a Comment

Popular posts from this blog

SQL Interview Questions:3

Image
3. FETCH THE EMPLOYEES WHOSE SALARY IS GREATER THAN AVERAGE SALARY OF THEIR DEPARTMENT. CREATE   table employee ( id int, name varchar (100), dept_Id int, salary int ) insert into employee values(1,'vineela',1,20000),(2,'lakshmi',1,30000),(3,'gayithri',1,30000), (4,'mukundh',2,45000),(5,'kavya',2,300000),(6,'sithara,2,45000) select * from employee method1:-         select a.name,a.dept_Id,a.salary  from employee a where a.salary >(select avg(salary) from         employee b where b.dept_Id=a.dept_Id)                                              method2:- select t1.name,t1.dept_Id, ,t1.salary  from employee as t1 join (select dept_Id,avg(salary) as avgsalary from employee group by dept_Id) as t2 on t1.dept_Id=t2.dept_Id where salary>avgsalary             ...
Read more

AZURE DATA FACTORY INTERVIEW QUESTIONS: FILES FORMATS

  21.Diffrence types of file formats? 1.Delimited text files       CSV Files and TSV Files   CSV Files:-            *Comma Separated Values           *  In which comma ,pipe etc. are used to separate the fields and values in CSV files.  TSV Files:-           * Tab separated values.           *In which tab or space are used to separate the fields and values.           *Fixed width data in which each field is allocated a fixed number of characters. 2.JSON           *Java Script Object Notation (JSON).            * JSON format file is a standard data interchange format.            *JSON files are text-based, human-readable, can be edited easily.     example:-          {         ...
Read more

AZURE DATA FACTORY INTERVIEW QUESTIONS :ACTIVITIES AND TYPES.

  ACTIVITIES:-      The Activities in a pipeline defines actions or operations to perform on your data. TYPES:-        1.DATA MOVEMENT ACTIVITIES.       2.DATA TRANSFORMATION  ACTIVITIES.       3. CONTROL FLOW ACTIVITIES.   1. DATA MOVEMENT ACTIVITIES :-         Copy Data :-                   The Copy Data Activity is the core tool in Azure data factory that can move the data from Source to Sink (destination). 2. DATA TRANSFORMATION  ACTIVITIES :-         Data flow:-               Data flow activity is a cloud native graphical data transformation tool.             types:-             1.Mapping Data flow             2.Wrangling Data flow.          1.Mapping Data flow:- ...
Read more