Here we have Creating table code according to syntax in Oracle APEX. CREATE TABLE DEPT ( DEPTNO NUMBER(10) NOT NULL, DNAME VARCHAR2(50) NOT NULL, LOC VARCHAR2(50) , CONSTRAINT DEPT_PK PRIMARY KEY (DEPTNO) ); Step 2: Emp table CREATE TABLE EMP( EMPNO NUMBER(10) NOT NULL, ENAME VARCHAR2(50) NOT NULL, JOB VARCHAR2(50) , MGR VARCHAR2(50) , HIREDATE DATE, SAL NUMBER(5) , COMM VARCHAR2(50) , DEPTNO NUMBER(10) NOT NULL, CONSTRAINT EMP_PK PRIMARY KEY (EMPNO), CONSTRAINT EMP_FK FOREIGN KEY ( DEPTNO ) REFERENCES DEPT (DEPTNO ) ); Step 3 CREATE TABLE SALGRADE ( GRADE NUMBER(10) NOT NULL, LOSAL NUMBER(10) , HISAL NUMBER(10) , CONSTRAINT SALGRADE_PK PRIMARY KEY (GRADE) ); Question: Give all employees records who have salaries in between 1000 and 2000 (both included) Get all employee names whose name the second letter is ‘A’. Retrieve all employees records who don’t take a commission. Get all employee's records who work as ‘CLERK’.
SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.
Here we have Creating table code according to syntax in Oracle APEX.
CREATE TABLE DEPT (
DEPTNO NUMBER(10) NOT NULL,
DNAME VARCHAR2(50) NOT NULL,
LOC VARCHAR2(50) ,
CONSTRAINT DEPT_PK PRIMARY KEY (DEPTNO)
);
CREATE TABLE EMP(
EMPNO NUMBER(10) NOT NULL,
ENAME VARCHAR2(50) NOT NULL,
JOB VARCHAR2(50) ,
MGR VARCHAR2(50) ,
HIREDATE DATE,
SAL NUMBER(5) ,
COMM VARCHAR2(50) ,
DEPTNO NUMBER(10) NOT NULL,
CONSTRAINT EMP_PK PRIMARY KEY (EMPNO),
CONSTRAINT EMP_FK FOREIGN KEY ( DEPTNO ) REFERENCES DEPT (DEPTNO )
);
CREATE TABLE SALGRADE (
GRADE NUMBER(10) NOT NULL,
LOSAL NUMBER(10) ,
HISAL NUMBER(10) ,
CONSTRAINT SALGRADE_PK PRIMARY KEY (GRADE)
);
Question:
Give all employees records who have salaries in between 1000 and 2000 (both included)
Get all employee names whose name the second letter is ‘A’.
Retrieve all employees records who don’t take a commission.
Get all employee's records who work as ‘CLERK’.
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