How does Oracle 12c distinguish between clauses in a SELECT statement that belong to an outer query and clauses that belong to a subquery?
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How does Oracle 12c distinguish between clauses in a SELECT statement that belong to an outer query and clauses that belong to a subquery?
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- THIS MODULE IS ABOUT SUBQUERIES, SO YOU MUST USE SUBQUERIES INSTEAD OF TABLE JOINS (a) From which two fields in which table can you calculate the enrollment of a section?(b) From which table can you get both course and section numbers?(c) Which field in table SECTION uniquely identifies a section, section id or section no?(d) Write a SQL statement to show sections and their enrollment.(e) Write a SQL statement to show sections with enrollment greater than five. Display both course andsection numbersWhat happens if we don’t specify the WHERE clause in an SQL DELETE FROM statement? a) statement compilation causes a “Syntax error”, and the statement is not executed. b) all the tuples of the relaton are deleted. c) none of the tuples of the relation is deleted. d) all the tuples not satisfying the condition are deleted. e) none of the above. Which one(s) of the following is(are) procedural? a) Relational Algebra b) Relational Calculus c) Tuple Relational Calculus d) Domain Relational Calculus e) SQL f) (a) and (e) e) (b) and (e).10. When we find out that there are some miss spellings in the query?
- In the SQL Oracle Application Write one query to return the employee_id, job_id, hire_date, and department_id of all employees and a second query listing employee_id, job_id, start_date, and department_id from the job_history table and combine the results as one single output. Make sure you suppress duplicates in the output.How can Oracle 12c determine whether clauses of a SELECT statement belong to an outer query or a subquery?Views in SQL are kind of virtual tables. A view also has rows and columns as they are in a real table in the database. We can create a view by selecting fields from one or more tables present in the database. A View can either have all the rows of a table or specific rows based on certain conditions. Under what circumstances would you create a View?
- select * from cast where cast_id=162652763; Use explain to display the query plan without creating any index. Now create an index to speed up the query. Use explain and timer to show the improvement.Imagine that you are a database manager at a company that makes custom shirts. One column in the database lists the wholesale price of the shirts. A second column lists the labor charge, which is currently set to 11 percent of the wholesale price of the shirt. A third column lists the retail price of the shirt, which is the combination of the wholesale price and the labor charge. Write the statements that calculate the values that belongs in the second and third columns. How could you use a query to format these columns?How does a parameter query differ from a select query?
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