Db2 interview question on sql query.Explains GROUP BY and CASE Statement.
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This is about how certain output can be achieved by using DB2 SQL queries. The query uses GROUP BY, COUNT and CASE statements to achieve the format.
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Correlated update vs merge
The document discusses different methods for updating a target table based on values from a source table: correlated update, merge, and update from select. It finds that correlated update has poor performance without an index on the source table, as it must do a full table scan for each target row. Merge and update from select leave unmatched rows unchanged, while correlated update updates them to empty strings. Update from select requires a unique index on the source table. Overall, update from select has better performance when updating a small percentage of rows and the target table has an index.
New folderAssignment _Sem2_2013.docxITECH10005000 Programmin.docx
New folder/Assignment _Sem2_2013.docx
ITECH1000/5000 Programming 1
School of Science, Information Technology and Engineering
Assignment 2Semester 2, 2013
Introduction
This assignment requires you to work with some lists and to explore some common algorithms. You will be working with a list of bank records which contain details of individual bank customers and their accounts.
You will be required to provide a hardcopy of a written report (a word document) with some of your answers. You will also be required to hand the whole assignment (both code and reports) in electronic form.
Task A
Download the files bank.txt and assignment2.py. The file bank.txt is the input file for the program. It consists of a number of lines of text, each with five fields. These fields are:
· The customer’s first name
· The customer’s last name
· The customer’s account number
· The account type (savings, credit or cheque)
· The account balance
Assignment2.py already has some functionality added – ignore that for the moment.
For each of the following functions provide the expected inputs, outputs and pseudocode in your report (note: you will probably find the assignment easier if you do this BEFORE you do your coding)
a) Write a new function (called readInputFileIntoList) which will read the file bank.txt and place individual customer records into a list (effectively a ‘list of lists’). The function should NOT take the bank list as a parameter. It should return the bank list via its return statement.
You may not assume that you know how many records are in the input file – it must work for any number of lines.
For each line in the input file you should create an individual list with five elements (listed above). Use the ‘split’ function to help you with this. Once you have created this list, add it to the bank list. The result of executing readInputFileInfoList should be a list of bank records – one for each line in the file.
b) Write a function called ‘printIndividualRecord’. It should take a list (corresponding to a single bank record) as a parameter. If the record is
Bruce Willis 123313 savings 405.00
the function should print out the details of the record in the following format
Bruce Willis has a savings account with account no: 123313
There is $405.00 in this account.
c) Write a function called ‘printAllRecords’, which calls printIndividualRecord for each record in the bank list. It should take the bank list as a parameter.
Task B
Examine the functions already authored in assignment2.py.
· swap
· maxListByItem
In the code, write a high-level description of what each of these functions is intended to do as a comment above the function code. This description should be no longer than five lines. Marks will be awarded according to how well your response reflects your understanding.
Task C
Examine the function ‘sortListUsingSelectionSort’ that has been written in assignment2.py. This function is not complete. Use the functions from task B to .
Part2 (1 Examen)
(1) The document is a test review for a database programming final exam covering topics like creating tables, adding columns, modifying data types, removing columns, and commenting on tables.
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2. Creating a pivot table with department in rows and average/max salary in values.
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Chapter9 more on database and sql
This document discusses various SQL functions and concepts including:
1. Single row and multiple row/aggregate functions where single row functions return one result per row and aggregate functions return one result for a group of rows. Common aggregate functions discussed are AVG, COUNT, MAX, MIN, and SUM.
2. The GROUP BY clause which combines records with the same field values and the HAVING clause which specifies conditions for grouped data.
3. Joins which combine data from multiple tables. Types discussed are Cartesian products and equi-joins.
4. SQL constraints including NOT NULL, DEFAULT, UNIQUE, and PRIMARY KEY constraints.
Bis 345-final-exam-guide-set-1-new
1. (TCO 1) Which of the following sets of SQL clauses represent the minimum combination of clauses to make a working SQL statement? (Points : 5)
SELECT, WHERE
FROM, WHERE
SELECT, FROM
FROM, ORDER BY
284566820 1 z0-061(1)
The query provides a bonus of 1000 to customers whose AMT_SPENT is less than their CREDIT_LIMIT. It will execute successfully and produce the required result, even if some AMT_SPENT values are null.
Cs practical file
This document contains a list of 23 programming problems/exercises related to C++ concepts like arrays, functions, classes, files, and data structures. Some examples include:
1) Writing a function to swap elements between columns of a 2D array.
2) Defining classes for concepts like Queue, Stack, Hotel booking etc. with relevant member functions.
3) Writing SQL queries to retrieve/manipulate data from provided tables on items, students etc.
4) Considering classes like Player derived from Coach and solving related problems.
The document provides detailed descriptions and examples for each problem/exercise.
HALL OF FAME INDUCTIONS
The document describes the duties of a database administrator (DBA) at the baseball hall of fame. As DBA, they supervise customer service reps who use the hall of fame database daily. The database contains information on hall of fame inductions that is displayed in museum projections and provided over the phone to requesting organizations. The DBA created different views of the database to restrict what information each representative can access.
SQL CHEAT SHEET
This document provides a SQL cheat sheet covering various SQL concepts needed for job interviews. It covers JOINs (LEFT JOIN, INNER JOIN, multiple joins, self joins), time and date functions (DATE_PART(), EXTRACT(), INTERVAL), aggregate functions (COUNT(), SUM(), AVG(), MIN(), MAX()), window functions (PARTITION BY, ORDER BY, RANK(), DENSE_RANK(), ROW_NUMBER()), and set operators (UNION, UNION ALL). For each concept, it provides a brief explanation, graphical representation, and example interview question with its solution. The cheat sheet is intended to help review SQL concepts for technical interviews.
Bis 345-final-exam-guide-set-2-new
1. (TCO 1) Which of the following sets of SQL clauses represent the minimum combination of clauses to make a working SQL statement? (Points : 5)
SELECT, WHERE
FROM, WHERE
SELECT, FROM
FROM, ORDER BY
Similar to Db2 interview question on sql query.Explains GROUP BY and CASE Statement. (20)
Top N and bottom N view on the same worksheet In Tableau
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New folderAssignment _Sem2_2013.docxITECH10005000 Programmin.docx
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