Concept explainers
Display values from table:
The contents from the table can be viewed by using “SELECT” statement which comes under Data Manipulation Language (DML). Syntax to view the contents using asterisk (*) is as follows:
SELECT * FROM table_Name;
Columns can also be retrieved by replacing all the column names in place of the asterisk symbol.
WHERE Statement:
“WHERE” statement is used limit the number of rows. For example: Consider a table “FTable” that has two columns named “FruitName” and “Color”. “WHERE” clause is used when there is a need to display the entire FruitName whose color is Red.
SELECT * FROM FTable WHERE color = 'red';
When the above statement is executed, red colored fruits get displayed.
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Chapter 7 Solutions
Database Systems: Design, Implementation, & Management
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- Write the SQL code that will change the PROJ_NUM to 14 for employees who were hired before January 1, 1994, and whose job code is at least 501. (You may assume that the table will be restored to its condition preceding this question.)arrow_forwardWrite the SQL code to delete the row for William Smithfield, who was hired on June 22, 2004, and whose job code is 500. (Hint: Use logical operators to include all of the information given in this problem.)arrow_forwardWrite the SQL code that will change the PROJ_NUM to 14 for employees who were hired before January 1, 1994, and whose job code is at least 501. When you finish Problems 7–15, the EMP_2 table will contain the data shown in Figure P8.15.arrow_forward
- Please help with pl/sql block!arrow_forwardUsing the data in the ASSIGNMENT table, write the SQL code that will yield the total number of hours worked for each employee and the total charges stemming from those hours worked, sorted by employee number. The results of running that query are shown in Figure P7.6.FIGURE P7.6 TOTAL HOURS AND CHARGES BY EMPLOYEEarrow_forwardUse %ROWTYPE for your cursor and use 3 tables in this activity - EMPLOYEES, JOBS, and DEPARTMENTS Write a PL/SQL block to read and display the last name, job title, and department name from departments 50 and 80 only. Display also the number of records returned by your PL/SQL block.arrow_forward
- Write SQL CODE List the Professor's First (EMP_FNAME) and Last names (EMP_LNAME) of those who teach more than 2 classes (CLASS table). Use Noncorrelated Subquery with INNER JOIN.arrow_forwardUsing the data in the ASSIGNMENT table, write the SQL code that will yield the total number of hours worked for each employee and the total charges stemming from those hours worked, sorted by employee number. The results of running that query are shown in Figure P7.6. EMP_NUM 101 103 104 105 108 113 115 117 EMP_LNAME News Arbough Ramoras Johnson Washington Joenbrood Bawangl Williamson SumOfASSIGN HOURS 3.1 19.7 11.9 12.5 8.3 3.8 12.5 18.8 SumOfASSIGN_CHARGE 387.50 1664.65 1218.70 1382.50 840.15 192.85 1276.75 649.54arrow_forward
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