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What is a View in SQL?
Ask: What is a View in SQL?
View
SQL
In a database, a view is the result set of a stored query on the data, which the database users can query just as they would in a persistent database collection object. This pre-established query command is kept in the database dictionary. Unlike ordinary base tables in a relational database, a view does not form part of the physical schema: as a result set, it is a virtual table computed or collated dynamically from data in the database when access to that view is requested. Changes applied to the data in a relevant underlying table are reflected in the data shown in subsequent invocations of the view. In some NoSQL databases, views are the only way to query data.
explain the microsoft SQL server
Ask: explain the microsoft SQL server
Answer:
SQL Server is a database server by Microsoft. The Microsoft relational database management system is a software product which primarily stores and retrieves data requested by other applications. … SQL is a special-purpose programming language designed to handle data in a relational database management system.
Explanation:
Hope it helps
Answer:
SQL Server is a database server by Microsoft. The Microsoft relational database management system is a software product which primarily stores and retrieves data requested by other applications. … SQL is a special-purpose programming language designed to handle data in a relational database management system.
Microsoft SQL Server (MSSQL) is widely used in enterprise deployments. MSSQL is a scalable data platform which includes several ETL (Extract, Transform and Load) tools and reporting services where data can be added, modified and queried using a standardized structured query language (SQL).
Evaluate the following SQL commandSELECT employee_id, hire_date, department_name FROM employees,
Ask: Evaluate the following SQL command
SELECT employee_id, hire_date, department_name FROM employees, departments
WHERE departments.department_id = employees.department_id
Select one:
a.
The SQL command will produce an error.
b.
The SQL command will give an incorrect output.
c.
The SQL command should have ALIAS for the table to produce a correct output.
d.
The SQL command will produce a correct output.
Answer:
Explanation:
D. This should produce a correct output.
I’m making a number of assumptions here. More specifically, that this is likely referring to the standard MySQL syntax (or identical in this context) and that both tables “employees” and “departments” contain columns “employee_id”, “hire_date”, and “department_name”. If one or both of these assumptions are wrong, then the answer should be A (error).
SELECT employee_id, hire_date, department_name
FROM employees, departments
WHERE departments.department_id = employees.department_id
This WHERE line compares the department_id from the “departments” table and “employees” table. It will only SELECT the “employee_id”, “hire_date” and “department_name” of the records FROM both tables IF their “department_id” values are the same.
True or False. In SQL, you cannot perform delete and
Ask: True or False. In SQL, you cannot perform delete and update commands without using where clause.
Answer:
True Ang sagot diyan ate
Evaluate the following PL/SQL. 1 DECLARE 2 v_employee_id employees.employee_id%TYPE :=
Ask: Evaluate the following PL/SQL.
1 DECLARE
2 v_employee_id employees.employee_id%TYPE := 114;
3 BEGIN
4 DELETE employees WHERE employee_id = v_employee_id;
5 END;
Select one:
a.
To execute successfully delete line 1,2,3,5.
b.
The PL/SQL will produce an error in line 2.
c.
The PL/SQL will delete employee number 114.
d.
The PL/SQL will produce an error in line 4.
Answer:
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Answer:
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What causes most errors in a database? * a. sqlb.
Ask: What causes most errors in a database? *
a. sql
b. human error
c. sql server
d. Internet access
C. SQL SERVER
EXPLANATION:
—, Causes and Resolutions · Bugs in SQL server itself · Abrupt system shutdown while the database is opened
HOPE IT HELP
Evaluate the following PL/SQL. 1 DECLARE 2 v_employee_id employees.employee_id%TYPE :=
Ask: Evaluate the following PL/SQL.
1 DECLARE
2 v_employee_id employees.employee_id%TYPE := 114;
3 BEGIN
4 DELETE employees WHERE employee_id = v_employee_id;
5 END;
Select one:
a.
The PL/SQL will produce an error in line 4.
b.
The PL/SQL will produce an error in line 2.
c.
The PL/SQL will delete employee number 114.
d.
To execute successfully delete line 1,2,3,5.
Answer:
12563739
Explanation:
yan Ang sagott salamt
Evaluate the following SQL command SELECT * FROM jobs WHERE
Ask: Evaluate the following SQL command SELECT * FROM jobs WHERE job_title LIKE ‘Manager%’ Select one:
a. The SQL command will produce an error.
b. The SQL command will display all employees with Manager position
c. No records will be displayed
d. The SQL command will display all records in the database
Answer:
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Evaluate the following PL/SQL. At what line number is the
Ask: Evaluate the following PL/SQL. At what line number is the error of the PL/SQL?
DECLARE
v_deptno NUMBER := 800;
e_invalid EXCEPTION;
BEGIN
DELETE FROM departments
WHERE department_id = v_deptno;
IF SQL % NOT_FOUND THEN
RAISE e_invalid;
END IF;
COMMIT;
EXCEPTION
WHEN e_invalid THEN
DBMS_OUTPUT.PUT_LINE(‘No such department id.’);
END;
Select one:
a.
8
b.
2
c.
3
d.
7
e.
12
Answer:
D. 7
Yan po yung answer
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is there a way we can directly execute the SQL
Ask: is there a way we can directly execute the SQL command by simply typing the SQL command?
Answer:
In some applications, having hard coded SQL statements is not appealing because of the dynamic nature of the queries being issued against the database server. Because of this, sometimes there is a need to dynamically create a SQL statement on the fly and then run that command. This can be done quite simply from the application perspective where the SQL statement is built on the fly whether you are using ASP.NET, ColdFusion or any other programming language. But how do you do this from within a SQL Server stored procedure?
How to build dynamic SQL statement in SQL Server
SQL Server offers a few ways of running a dynamically built SQL statement. Here are a few options:
Writing a query with parameters
Using EXEC
Using sp_executesql
We will use the AdventureWorks database for the below examples.
Things to Note
Although generating SQL code on the fly is an easy way to dynamically build statements, it does have some drawbacks.
One issue is the potential for SQL Injection where malicious code is inserted into the command that is being built. The examples below are very simple to get you started, but you should be aware of SQL Injection and ways to prevent it by making sure your code is robust to check for any issues before executing the statement that is being built.
Another issue is the possible performance issues by generating the code on the fly. You don’t really know how a user may use the code and therefore there is a potential for a query to do something you did not expect and therefore become a performance issue. So once again, you should make sure your code checks for any potential problems before just executing the generated code.
i hope its help
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