: Q1.Please write a query statement from emp table to display deptno 10’s empno, ename, sal, and a new_sal which is increase by 15% from the original sal (round the new_sal value to a whole number). Label the column headings to EMPNO, ENAME, SAL, and NEW_SAL. Answer: SELECT empno, ename, sal, new_sal FROM deptno WHERE new_sal = orginal_sal * 1.15 ALTER TABLE deptno RENAME COLUMN empno to EMPNO; ALTER TABLE deptno RENAME COLUMN ename TO ENAME; ALTER TABLE deptno
SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.
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step 1:
Task 1: Q1.Please write a query statement from emp table to display deptno 10’s empno, ename, sal, and a new_sal which is increase by 15% from the original sal (round the new_sal value to a whole number). Label the column headings to EMPNO, ENAME, SAL, and NEW_SAL.
Answer:
SELECT empno, ename, sal, new_sal
FROM deptno
WHERE new_sal = orginal_sal * 1.15
ALTER TABLE deptno
RENAME COLUMN empno to EMPNO;
ALTER TABLE deptno
RENAME COLUMN ename TO ENAME;
ALTER TABLE deptno
RENAME COLUMN sal TO SAL;
ALTER TABLE deptno
RENAME new_sal empno TO NEW_SAL;
step2:
Task 2: Please write a query statement from emp table to display deptno 30’s empno, ename, sal, comm, and total_income which is a new column of the amount of sal + comm. Label the column heading to EMPNO, ENAME, SAL, COMM, TOTAL_INCOME. The result should be like below:
Answer:
ALTER TABLE deptno
ADD total_income INT NOT NULL
SELECT empno, ename, sal, comm, total_income
FROM deptno
WHERE total_income = sal + comm;
ALTER TABLE deptno
RENAME COLUMN empno TO EMPNO;
ALTER TABLE deptno
RENAME COLUMN ename TO ENAME;
ALTER TABLE deptno
RENAME COLUMN sal to SAL;
ALTER TABLE deptno
RENAME comm empno TO COMM;
ALTER TABLE deptno
RENAME total_income TO TOTAL_INCOME;
step3:
Task 3:
Please write a query statement from emp table for all employees to display employee's ename, job, and name_length. The name_length must be less than or equal to 5 characters. Label the column heading to ENAME, JOB, and NAME_LENGTH. Order your results by the length of ename descending order.
Answer:
SELECT FNAME
AS ENAME, JOB, LENGTH(FNAME)
AS NAME_LENGTH
FROM the employees,
WHERE LENGTH(FNAME) <= 5 ORDER BY LENGTH(FNAME) DESC;
And here is the question.
Step 4. Please write .a query statement from emp table to display deptno 30’s ename, deptno, sal, and sal_format for all employees. Format the sal_format to be 15 characters long with a left-padded $. Order your results by the sal column. Label the column headingto ENAME, DEPTNO, SAL, and SAL_FORMAT. The result should be like below:
[image brlow - screenshot_Q1.png]
Here is the material needed to answer the question:
Material:
- https://drive.google.com/file/d/14OwWDIybjAIeuHCO7McupV08gJs9nB-8/view?usp=sharing
- https://drive.google.com/file/d/1npRH8JoJ6GYBzPU3iNjLXluvCyhr2tMu/view?usp=sharing
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