If you are looking for the answer of what does where do in sql, you’ve got the right page. We have approximately 10 FAQ regarding what does where do in sql. Read it below.
What sql command do you use to make changes to
Ask: What sql command do you use to make changes to existing data in a table?
Answer:
ALTER Command
Explanation:
ALTER is an SQL command used in Relational DBMS and is a Data Definition Language (DDL) statement. ALTER can be used to update the table’s structure in the database (like add, delete, drop indexes, columns, and constraints, modify the attributes of the tables in the database).
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What does the word "query" mean in Structured Query Language
Ask:
What does the word “query” mean in Structured Query Language or SQL?
Answer:
SQL is an abbreviation for structured query language, and pronounced either see-kwell or as separate letters. SQL is a standardized query language for requesting information from a database. The original version called SEQUEL (structured English query language) was designed by an IBM research center in 1974 and 1975.
Explanation:
Answer:
A query is a question or inquiry about a set of data.
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 does sql stands for
Ask: what does sql stands for
Answer:
Structured Query Language
SQL stands for Structured Query Language. SQL lets you access and manipulate databases. SQL became a standard of the American National Standards Institute (ANSI) in 1986, and of the International Organization for Standardization (ISO) in 1987.
How does SQL affect the success of a business?
Ask: How does SQL affect the success of a business?
Answer:
______________________________________________________________________________________
Explanation:
What does SQL stand for?
Ask: What does SQL stand for?
Answer:
“sequel”; Structured Query Language
Explanation:
Structured Query Language is a computer language that we use to interact with a relational database. SQL is a tool for organizing, managing and retrieving archived data from a computer database.
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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how does data works in SQL manner?
Ask: how does data works in SQL manner?
Answer:
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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.
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.
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