If you are looking for the answer of how to put where condition in sql, you’ve got the right page. We have approximately 10 FAQ regarding how to put where condition in sql. Read it below.
how i create table courses in sql
Ask: how i create table courses in sql
Answer:
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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.
how to create a database using microsoft SQL?
Ask: how to create a database using microsoft SQL?
Answer:
Explanation:
Open Microsoft SQL Management Studio.
Connect to the database engine using database administrator credentials.
Expand the server node.
Right click Databases and select New Database.
Enter a database name and click on OK to create the database.
1. How does tuning in PL/SQL work?2. What is the
Ask: 1. How does tuning in PL/SQL work?
2. What is the importance of tuning in PL/SQL?
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Answer:
1.When to Tune PL/SQL Code
The information in this chapter is especially valuable if you are responsible for:
Programs that do a lot of mathematical calculations. You will want to investigate the datatypes PLS_INTEGER, BINARY_FLOAT, and BINARY_DOUBLE.
Functions that are called from PL/SQL queries, where the functions might be executed millions of times. You will want to look at all performance features to make the function as efficient as possible, and perhaps a function-based index to precompute the results for each row and save on query time.
Programs that spend a lot of time processing INSERT, UPDATE, or DELETE statements, or looping through query results. You will want to investigate the FORALL statement for issuing DML, and the BULK COLLECT INTO and RETURNING BULK COLLECT INTO clauses for queries.
Older code that does not take advantage of recent PL/SQL language features. (With the many performance improvements in Oracle Database 10g, any code from earlier releases is a candidate for tuning.)
Any program that spends a lot of time doing PL/SQL processing, as opposed to issuing DDL statements like CREATE TABLE that are just passed directly to SQL. You will want to investigate native compilation. Because many built-in database features use PL/SQL, you can apply this tuning feature to an entire database to improve performance in many areas, not just your own code.
Before starting any tuning effort, benchmark the current system and measure how long particular subprograms take. PL/SQL in Oracle Database 10g includes many automatic optimizations, so you might see performance improvements without doing any tuning.
2.How PL/SQL Optimizes Your Programs
In releases prior to 10g, the PL/SQL compiler translated your code to machine code without applying many changes for performance. Now, PL/SQL uses an optimizing compiler that can rearrange code for better performance.
You do not need to do anything to get the benefits of this new optimizer. It is enabled by default. In rare cases, if the overhead of the optimizer makes compilation of very large applications take too long, you might lower the optimization by setting the initialization parameter PLSQL_OPTIMIZE_LEVEL=1 instead of its default value 2. In even rarer cases, you might see a change in exception behavior, either an exception that is not raised at all, or one that is raised earlier than expected. Setting PL_SQL_OPTIMIZE_LEVEL=0 prevents the code from being rearranged at all.
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what is the significance of knowing how sql injection works
Ask: what is the significance of knowing how sql injection works
SQL injection is a web security vulnerability that allows an attacker to interfere with the queries that an application makes to its database. It generally allows an attacker to view data that they are not normally able to retrieve.
Answer:
SQL injection is a web security vulnerability that allows an attacker to interfere with the queries that an application makes to its database. It generally allows an attacker to view data that they are not normally able to retrieve.
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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how does data works in SQL manner?
Ask: how does data works in SQL manner?
Answer:
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Evaluate the given SQL syntaxINSERT INTO table_name (column1, column2, column3,
Ask: Evaluate the given SQL syntax
INSERT INTO table_name (column1, column2, column3, …)
VALUES (value1, value2, value3, …)
WHERE condition;
Select one:
a.
Correct syntax.
b.
This will produce an error.
c.
Wrong placement of WHERE and VALUES
d.
INSERT should be UPDATE command
B. This will produce an error.
SQL – INSERT Query
Use the SQL INSERT INTO Statement to insert new rows of data into a database table. The INSERT INTO statement has two fundamental syntaxes, which are seen here:
INSERT INTO TABLE_NAME (column1, column2, column3,…columnN)
VALUES (value1, value2, value3,…valueN);
These are the names of the columns in the table that you wish to enter the data into: column1, column2, column3,…columnN. If you are adding values to all of the table’s columns, you might not need to specify the column(s) name in the SQL query. But make sure the data are arranged in the same order as the table’s column headings.
If the other table has a specific set of fields needed to populate the first table, you can fill a table with data using a select statement over it. The syntax is as follows:
INSERT INTO first_table_name [(column1, column2, … columnN)]
SELECT column1, column2, …columnN
FROM second_table_name
[WHERE condition];
To learn more about SQL – INSERT Query, just click the link below:
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How does SQL affect the success of a business?
Ask: How does SQL affect the success of a business?
Answer:
______________________________________________________________________________________
Explanation:
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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