You can display all the date in a table by using the select statement. By using * asterisk in a select statement it displays the data of all the columns in the table
Example 1: select * from team;
Where team is the table name and ( * ) Asterisk is a wildcard character which displays all the data in the table along with all the columns
Selecting Specific Columns
If you want to display certain columns from the team table then you need to write the name of the columns after the (*) Asterisk.Question 1) Display First_name, Sex, Age from team
Answer) select first_name,sex,age from team;
In similar manner you can write your own statements and display the required results.
In the previous post we learned to create a table in oracle. Today lets insert data into the table we created. Below is the format of the table we created. first_name, last_name, sex and age are the columns in our table.
So to insert data into these columns type :
insert into team values(‘Anish’,’Sangamam’,’male’,23);
Here team is the table name. Similarly, insert into team values(‘anish’, ‘last’, ’20’, 10);
Insert Values into the Table at Run-time
Inorder to insert values at run time you need to add the amperand sign before the column names and instead of putting in the values you simply type ampersand followed by the column name.
Insert into team values(‘&first_name’,’&last_name’,’&sex’,’&age’);
When you run the query it will ask you for the firstname, lastname,sex and age.
Today, I would like to share what I have learned while studying oracle. I’m not going by the books right now as in the books you would learn on how to fetch data from the data base using the select statement but I’m starting of with creating a table.
Before we start, you need to have knowledge about the commonly used data types. They are char, varchar, number and date. To get more information on data types and their size read Oracle Data Types.
Syntax to Create a Table :
create table tablename (“column1” “data type” [constraint], “column1” ‘datatype'[constraint], “column1” ‘datatype’ [constraint], “column1” ‘datatype’ [constraint]);
- “Constraint” – we use constraints to limit the type of data that go into a table
create table team (first_name varchar(20), last_name varchar(20) , sex varchar(10), age varchar(99));
Here team is the tablename , first_name is the column, varchar is the datatype and the values in parenthesis are constraints
That’s how you create a table. you can create your own table. Check out another example
create table linkinpark (first_name varchar(20), last_name varchar(20));
Oracle SQL * Plus
After successfully installing Oracle 10G you will first need to unlock Scott account and below are the steps that should help you do the same.
Steps to Unlock Scott Account in SQL Plus
- Open command prompt with administrator rights
- Type sqlplus / as sysdba
- alter user scott identified by tiger;
- alter user scott account unlock;
- conn scott/tiger
- Open SQL * Plus
As simple as that. Follow the steps in the same order and it would certainly unlock Scott Account. Enjoy