Q.1.3Alter the EMPLOYEES table to add a column as specified below: EMPLOYEES AGE SMALLINT Q.1.4 Update the contents of the EMPLOYEES table to populate the new AGE field that was added to the table in Q.1.3. The age should be calculated based on the current date and the date of birth. Write a query that will display doctors' names that have not issued any doctor’s certificates to employees yet. Sample Results: DOCTOR_NAME Julia Robbins
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.
Q.1.3Alter the EMPLOYEES table to add a column as specified below:
EMPLOYEES
AGE SMALLINT
Q.1.4 Update the contents of the EMPLOYEES table to populate the new AGE field that was added to the
table in Q.1.3. The age should be calculated based on the current date and the date of birth.
Write a query that will display doctors' names that have not issued any doctor’s
certificates to employees yet.
Sample Results:
DOCTOR_NAME
Julia Robbins
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