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641 Week 11 Outline on MongoDB
Posted on 11/8/2025) by Liping Liu
(641 Week 11 Outline on MongoDB) Lecture 1: NoSQL Database
NoSQL Databases do not organize data as tables linked by PK-FK relations. Instead, they may use one of the following data models:
Document Model (e... more >>
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641 Week 9 Outline
Posted on 10/26/2025) by Liping Liu
(641 Week 9 Outline) Review:
1. Find employees who make more than all managers
2. Find the maximum average salaries of all departments
3. Find the number of columns in EMP table
4... more >>
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641 Week 7 Outline
Posted on 10/11/2025) by Liping Liu
(641 Week 7 Outline) Warm-Up Queries:
Find the employment year of each employee
Find the departments in Dallas
Find the salesmen who were hired after 1980
--Find menagers whose name ends with M
select enamefrom empwhere job = 'MANAGER' and ename like '%M';
--Give salesman 100 commission
update empset comm = comm + 100where job = 'SALESMAN';
--handle missing values
upate empset comm = 0where comm is null;
select 12*sal + commfrom empgroup by empno;
--use nvl(comm, 0)
update empset comm = nvl(comm, 0) + 100where job = 'SALESMAN';
Lecture 1: Intermediate SQL Programming: Join is to merge two table so that the result will have all the columns and rows from both tables; matching records from the two tables are merged into one record in the pool, but the non-matching records are added to the pool with missing values for the columns of the other table... more >>
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Oracle Client Setup and Account Admin
Posted on 10/5/2025) by Liping Liu
(Oracle Client Setup and Account Admin) Oracle Data Access Component for Database Programming
If you need to connect to Oracle in Visual Studio to program Oracle databases, you just need to download Oracle... more >>
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