How to Add a Row in SQL
In this post how to add a row in SQL, we will discuss about inserting rows in sql tables. This is a very common question how to add a row in SQL. 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.
How to know the name of the various columns and their respective data types?
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.
To add a row in a table in sql, we have to use insert into command. The use of insert into command is quite simple.
Insert into Command
The insert into command is helpful for our query “ how to add a row in sql “ . With the help of insert into command, we can add rows in a table.
The General Syntax of Insert into Command
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)
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, 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’);
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 donot 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.
How to add data in SQL Table
The answer to this question How to add data in SQL Table is the use of insert into Command. To add data in sql table, first thing is to know the name of the table, column names of the table and data types and constraints of columns of table. Inserting rows , inserting data, add data and add rows are interchangeable terms.
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