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SQL Homework Help

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  • Structured Query Language
  • Filtering, combining, sub-setting of tables.
  • Functions, procedures, aggregations
  • Data Manipulation:
  • insert update delete
  • A query produces tabular results, which can be used as tables again in sub-queries, or stored in a database
  • The standard for relational database management systems (RDBMS)
  • SQL-92 and SQL-99 Standards Purpose:
  • Specify syntax/semantics for data definition and manipulation
  • Define data structures
  • Enable portability
  • Specify minimal (level 1) and complete (level 2) standards
  • Allow for later growth/enhancement to standard

Clear Concept Of SQL by taking SQL Homework Help

  • The user specifies a certain situation.
  • The program will go through of the information in the database file and choose those records that fulfill the condition.
  • Statistical information of the data.
  • The result of the query will then be stored in form of a table.

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SQL Sample Assignment

Part3. SQL

Introduction

Data Definition Language (DDL)

Data Manipulation Language (DML)

Data Control Language (DCL)

Data Query Language (DQL)

Complex Query in SQL

INTRODUCTION TO SQL

SQL means Structured Query Language for accessing and manipulating data held in a Relational database management system. It is a non-procedural language.

SQL Commands are divided into four categories;

q DDL (Data Definition Language) used to define the data. For example, CREATE TABLE

q DML (Data Manipulation Language) such as, INSERT and DELETE are used to manipulate data.

q DCL (Data Control Language) used to control access to data. For example, GRANT.

q Query (Retrieving data) used to retrieve data using SELECT.

DML and Query are also collectively called as DML. And DDL and DCL are called as DDL.

DDL

DDL stands for Data Definition Language refers to the CREATE, ALTER and DROP statements.

Data Definition Language allows to add or modify or delete the logical structures which contain the data or which allow users to access or maintain the data.

Some examples:

  • CREATE - to create objects in the database.

CREATE TABLE table_name
(
column_name1 data_type (size),
column_name2 data_type (size),
column_name3 data_type (size),
....
);

  • ALTER - alters the structure of the database

ALTER TABLE table_name
ALTER COLUMN column_name datatype

  • DROP - delete objects from the database

ALTER TABLE table_name DROP INDEX index_name; // DROP INDEX Syntax

Or

DROP TABLE table_name; // DROP TABLE

Or

DROP DATABASE database_name; // DROP DATABASE

  • TRUNCATE - remove all records from a table, including all spaces allocated for the records are removed

TRUNCATE TABLE table_name;

  • COMMENT - add comments to the data dictionary

/*...*/ (Comment)

  • RENAME - rename an object

ALTER TABLE oldtable RENAME TO newtable;

DML

DML stands for Data Manipulation Language refers to the INSERT, UPDATE and DELETE statements

Data Manipulation Language allows to add or modify or delete data itself.


Some examples:

  • SELECT - retrieve data from the a database

SELECT column_name,column_name
FROM table_name;

Or

SELECT * FROM table_name;

  • INSERT - insert data into a table

INSERT INTO table_name
VALUES (value1,value2,value3 ,...);

Or

INSERT INTO table_name (column1, column2,column3,...)
VALUES (value1,value2,value3 ,...);

  • UPDATE - updates existing data within a table

UPDATE table_name
SET column1=value1,column2= value2,...
WHERE some_column=some_value;

  • DELETE - deletes all records from a table, the space for the records remain

DELETE FROM table_name

Or

DELETE FROM table_name
WHERE some_column=some_value;

  • MERGE - UPSERT operation (insert or update)

MERGE <hint> INTO <table_name>
USING <table_view_or_query>
ON (<condition>)
WHEN MATCHED THEN <update_clause>
WHEN NOT MATCHED THEN <insert_clause>;

  • CALL - call a PL/SQL or Java subprogram
  • EXPLAINPLAN - explain access path to data
  • LOCKTABLE - control concurrency

DCL

DCL stands for Data Control Language refers to the GRANT and REVOKE statements

DCL is used to grant or revoke permissions on databases and their contents. DCL is about security.


Some examples:

  • GRANT - gives user's access privileges to database
  • REVOKE - withdraw access privileges given with the GRANT command

TCL


Transaction Control (TCL) statements are used to manage the changes made by DML statements. It allows statements to be grouped together into logical transactions.

  • COMMIT - save work done
  • SAVEPOINT - identify a point in a transaction to which you can later roll back
  • ROLLBACK - restore database to original since the last COMMIT
  • SETTRANSACTION - Change transaction options like isolation level and what rollback segment to use

DQL

DQL stands for Data Query Language refers to the SELECT, SHOW and HELP statements (queries).

COMPLEX QUERY IN SQL

1) To fetch ALTERNATE records from a table. (EVEN NUMBERED)

select * from emp

where rowid in (select decode( mod( rownum, 2), 0, rowid, null)

from emp);

2) To select ALTERNATE records from a table. (ODD NUMBERED)


select * from emp

where rowid in ( select decode ( mod ( rownum, 2 ), 0, null , rowed )

from emp);

3) Count MGR and their salary in emp table.

select count(MGR), count(sal)

from emp;

4) In emp table add comm+sal as total sal .

select ename,(sal+nvl(comm,0)) as totalsal

from emp;

5) Select any salary <3000 from emp table.

select * from emp

where sal > any (select sal from emp where sal<3000);

6) Select all salary <3000 from emp table.

select * from emp

where sal > all (select sal from emp where sal < 3000 );

7) Select all the employee group by deptno and sal in descending order.

select ename,deptno,sal from emp

order by deptno, sal

desc;

8) How can I create an empty table emp1 with same structure as emp?

Create table emp1 as select * from emp

where 1=2;

9) How to retrive record where sal between 1000 to 2000?


Select * from emp

where sal>=1000 And sal<2000

10) Find the 3rd MAX salary in the emp table.


select distinct sal from emp e1

where 3 = (select count (distinct sal )

from emp e2

where e1.sal <= e2.sal );

11) Find the 3rd MIN salary in the emp table.


select distinct sal from emp e1

where 3 = (select count(distinct sal)

from emp e2

where e1.sal >= e2.sal);

12) Select FIRST n records from a table.


select * from emp

where rownum <= &n;

13) Select LAST n records from a table


select * from emp

minus

select * from emp

where rownum <= (select count(*) - &n from emp);

14) List dept no., Dept name for all the departments in which there are no employees in the department.


select * from dept

where deptno not in (select deptno from emp);


alternate solution:

select * from dept a

where not exists (select * from emp b where a.deptno = b.deptno);


altertnate solution:

select empno,ename,b.deptno,dname from emp a, dept b

where a.deptno(+) = b.deptno and empno is null;

15) How to get 3 Max salaries ?


select distinct sal from emp a

where 3 >= (select count(distinct sal)

from emp b

where a.sal <= b.sal) order by a.sal

desc;

16) How to get 3 Min salaries ?


select distinct sal from emp a

where 3 >= (select count(distinct sal)

from emp b

where a.sal >= b.sal);

17) How to get nth max salaries ?


select distinct hiredate from emp a

where &n = (select count(distinct sal)

from emp b

where a.sal >= b.sal);

18) Select DISTINCT RECORDS from emp table.


select * from emp a

where rowid = (select max(rowid)

from emp b

where a.empno=b.empno);

19) How to delete duplicate rows in a table?


delete from emp a

where rowid != (select max(rowid)

from emp b

where a.empno=b.empno);

20) Count of number of employees in department wise.


select count(EMPNO), b.deptno, dname from emp a, dept b

where a.deptno(+)=b.deptno

group by b.deptno,dname;

21) Suppose there is annual salary information provided by emp table. How to fetch monthly salary of each and every employee?

select ename,sal/12 as monthlysal from emp;

22) Select all record from emp table where deptno =10 or 40.

select * from emp

where deptno=30 or deptno=10;

23) Select all record from emp table where deptno=30 and sal>1500.

select * from emp

where deptno=30 and sal>1500;

24) Select all record from emp where job not in SALESMAN or CLERK.

select * from emp

where job not in ('SALESMAN','CLERK');

25) Select all record from emp where ename in 'BLAKE','SCOTT','KING'and'FORD'.

select * from emp

where ename in('JONES','BLAKE','SCOTT','KING','FORD');

26) Select all records where ename starts with ‘S’ and its lenth is 6 char.

select * from emp

where ename like'S____';

27) Select all records where ename may be any no of character but it should end with ‘R’.

select * from emp

where ename like'%R';

28) Select all records where dept no of both emp and dept table matches.


select * from emp

where exists(select * from dept where emp.deptno=dept.deptno)

29) If there are two tables emp1 and emp2, and both have common record. How can I fetch all the recods but common records only once?


(Select * from emp)

Union

(Select * from emp1)

30) How to fetch only common records from two tables emp and emp1?


(Select * from emp)

Intersect

(Select * from emp1)

31) How can I retrive all records of emp1 those should not present in emp2?


(Select * from emp)

Minus

(Select * from emp1)

32) Count the totalsa deptno wise where more than 2 employees exist.

SELECT deptno, sum(sal) As totalsal
FROM emp
GROUP BY deptno
HAVING COUNT(empno) > 2

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