Thursday, 4 May 2017

How to add data to a table in sql

How to add data to a table in sql


In this post how to add data to a table in sql , we will discuss about inserting rows in sql tables. This is a very common question how to add data to a table in sql  . Adding data means inserting rows in sql tables. Before we insert data into tables , We first have to create tables in sql database. 
If the tables are already created, then before you enter data into a SQL database table, you have to know the name of the table as well as the various columns of the table. Along with names of the columns, we you have to be familiar with the data types of the various columns of the table.
Is this possible to know the name and data types of various columns of the table, yes this is quite simple to know the name of the columns and their data types. This can be done by using desc table command

Desc Table Command

The Desc Table command of SQL is to describe the structure of the table.
For example if we supply command like this : Desc employee;
This will display the whole structure of the employee table. It will display the name of the columns along with column specifications.
When you came to know the names of various columns and their data types, their widths and constraints, we can add rows to the table.
While inserting rows into tables, you have to take care with number of columns and their data types.
 
How to add data to a table in sql 1
How to add data to a table in sql

How to add data to a table in sql


To  to add data to a table in sql, we have to use insert into command. The use of sql insert statement is quite simple. 
sql insert statement
The sql insert statement is helpful in adding new rows to a table in sql.

The General Syntax of sql insert statement

Insert into <table name> values (value1, value 2,…);

Here table name is the name of the table in which you wants to add rows.
Suppose the name of the table is employee, the insert statement will be like this;

Insert into employee values (101, ‘SAM’);

After execution of the statement, the following message will be displayed
I row(s) created.
Here, you have to be care full, 101 will be added to first column of the table and SAM will be added to the second column of the table.
It is necessary to take care of data types of while inserting rows in a table.                   
With one insert into command, you can add only one row in a table. For Multiple rows , we have to use insert into command multiple times.
Few more examples of Insert into Command.
Given a table named employee with columns ecode->char(4), ename->varchar2(30), ecity->varchar2(30)
  Employee Table
Ecode
Ename
Ecity

Insert into employee values (‘E001’,’SAM’,’Florida’);
Here the first value E001 will be stored in first column of the table, second value SAM will be stored in second column of the table and third value Florida will be stored in  the third column of the table. In this case, user must be aware about the sequence of the columns of employee table. If by mistake he supply insert into command as Insert into employee values (‘SAM’,’E001’,’Florida’);
In this case employee name will be stored in employee code column and employee code will be stored in employee name column.

To avoid such problems, supply insert into like this:

Insert into employee(ecode, ename, ecity ) values (‘E001’,’SAM’,’Florida’);
How to add data to a table in sql oracle

How to add data to a table in sql

This will add a row in database table, in this case E001 will be stored in ecode, SAM will be stored in ename and Florida will be stored in ecity column of the employee table.
Main thing here is , you don't have to remember the sequence of columns in the table. You can supply the above insert into command as : Insert into employee (ename, ecode, ecity ) values (‘SAM’,’E001’,’Florida’);

Here you can see, we had altered the sequence of values, we had written SAM as first value and E001 as second value, we had also altered the sequence of column names in the above statement, ename is given first and then ecode.

How to insert multiple rows in SQL Table

To insert multiple rows in a table,  we have to supply insert into command as
Insert into employee values (&eocde, &ename,&ecity);

When you supply this command, the following output will be generate.

Enter Value for Ecode :
Here you have to supply value for ecode like ‘E001’
After this you will get –
Enter Value for Ename :
Here you have to supply value for ename like ‘SAM’
After this you will get –
Enter Value for Ecity :

Here you have to supply value for ecity like ‘Florida’

After this following message will be generated –
1 row(s) created.

After this sql prompt will come.
Sql>

Here you have to write run
Sql>run;

Run command of sql executes the last executable statement stored in Sql buffer. In this case it is : 

Insert into employee values (&eocde, &ename,&ecity);
Again you have to supply new values, you can repeat this step for as many times as you want.
So this was all about How to add data to a table in sql
Summary
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