Latest Tutorials| Questions and Answers|Ask Questions?|Site Map



Home Answers Viewqa JDBC disallow NULL values in a table.
Login         

View Questions and Answers by Category

Advertisements


 
Have Programming Question? Ask it here!
 
 
 


Clark
disallow NULL values in a table.
2 Answer(s)      4 years and 2 months ago
Posted in : JDBC


How do I disallow NULL values in a table?


Advertisement
View Answers

November 15, 2010 at 4:07 PM


Hi friends,

It is a constraints, so It is called column integrity constraints, most of the time it is aplied at table creation time. Most databases allow a default value for the column as well. The following SQL statement displays the NOT NULL constraint: CREATE TABLE book( Id VARCHAR(25) NOT NULL, nameINTEGER NOT NULL, Price NUMERIC(5, 2) NOT NULL );

Note: Note that some databases won't allow the constraint to be applied after table creation.

Thanks.



November 15, 2010 at 4:09 PM


Hi friends,

It is a constraints, so It is called column integrity constraints, most of the time it is aplied at table creation time. Most databases allow a default value for the column as well. The following SQL statement displays the NOT NULL constraint:

CREATE TABLE book( Id INTEGER NOT NULL, name VARCHAR(25) NOT NULL, Price NUMERIC(5, 2) NOT NULL );

Note: Note that some databases won't allow the constraint to be applied after table creation.

Thanks.



Related Tutorials/Questions & Answers:
disallow NULL values in a table.
disallow NULL values in a table.  How do I disallow NULL values in a table
Mysql Alter Not Null
of a table have mandatory values or not to be remain Null. Understand with Example... fieldnames and datatypes respectively. Each records in the table created with Null values.          Create a table "user
Advertisements
inserting dropdown values into database table
inserting dropdown values into database table   hi i want to insert dropdown values into a database table by using jsp
dispalying arraylist values in table form
dispalying arraylist values in table form  My result is in arraylist and i want to display it in table form using iterator tag
Printing Values of Resultset to Html Table
Printing Values of Resultset to Html Table  I have a resultset and I need to collect the resultset values into the arraylist into a table... in advance   JSP Display values of ResultSet to HTML table: <%@page
Passing java variables from JSP to Servlet - return null values
from JSP to servlet gives null values. I got msg=null. Is there another way...Passing java variables from JSP to Servlet - return null values  I... != null){ dispatcher.forward(request, response); } In MyServlet.java I have included
Why the null values are stored in Database when I am sending proper values?
Why the null values are stored in Database when I am sending proper values... but the other details are not stored in the Database. Instead of other values, there null values are stored in the Database. Please guide me. Ask any more details
Inserting values in MySQL database table
Inserting values in MySQL database table   ... insert values in the MySQL database table. We know that tables store data in rows... the facility for inserting the values in MySQL database table. Description
SQL NOT NULL Constraint
NULL values. This specify that NOT NULL Constraint enforce the field to accept... create a table ,we define a field attribute, data type, null value etc...; and "Stu_Class" column not to accept NULL values. The insert
inserting all the values in a html table column
inserting all the values in a html table column  strong text hai everyone, i'm a fresher to servlet i need to know that, how can i insert all the values in a html table column into a database. Thanks in advance
Mysql Alter Allow Null
of the table. The Null Type column can be leave empty. Understand with Example The section... ' definition and modify keyword allows the null value to be 'YES' in the table 'usertable'. ALTER table usertable Modify last_name varchar(50) null
Inserting values into a database table of selected DropDown in jsp.
Inserting values into a database table of selected DropDown in jsp.  ... to insert all selected values in data base correspondent to each like if user selected india and then goa. I want to insert it to a table which has two fields
How to Display values from databse into table
How to Display values from databse into table  I want to display values from database into table based on condition in query, how to display... enter either bookname or authorname and click on search button the values from
SQL Alter Column Not Null
type, null etc. The created table have null values in field name. The 'Yes... should not be null in your table. Understand with Example..._Table'. Modify keyword in SQL Query  modify the null value
JSP textbox autopopulation on basis of SQL table values
JSP textbox autopopulation on basis of SQL table values  Hi, I need to achieve the following on J2EE platform Could you please help? The following table is created in MySQL DB: Problem type Status Responsible LEGAL
PHP SQL Null
; This example describes about handling NULL values in sql query in php. The result produced by SQL SELECT command may contain NULL or non-Null values. So when we need to work on these values then the NULL values may not work
how to access radio buttons selected in a servlet??...iam unable to retrieve values...it is returning NULL
how to access radio buttons selected in a servlet??...iam unable to retrieve values...it is returning NULL  <html> <head> <..."; } } //Here the radio0 returns null value.pls advice me
how to access radio buttons selected in a servlet??...iam unable to retrieve values...it is returning NULL
how to access radio buttons selected in a servlet??...iam unable to retrieve values...it is returning NULL  <html> <head> <..."; } } Here the radio0 returns null value.pls advice me
how to update values of a html form into an excel table using java servlets?
how to update values of a html form into an excel table using java servlets... table ,but my program is working till generation of receipt and the values... to be filled. after filling the form the servlet generates a receipt and the values should
how to load values of html form into an excel table using java servlet?
how to load values of html form into an excel table using java servlet? .... after filling the form the servlet generates a receipt and the values should be loaded into an excel table automatically. i have created a dsn for excel table
how to count unique and duplicate values from one table in mysql?
how to count unique and duplicate values from one table in mysql?  I have use EMP table.I want to count unique and duplicate records from emp table and how to use in java program
How to compare two tables, and insert values which r not in one table to another table?
How to compare two tables, and insert values which r not in one table... insert the values to main_table... here is my sql query insert into Main_Table MT (MT.serialno) values (Select SerialNo Main_Table MT from where not exists
how to retrieve data from table with runtime values in sql?
how to retrieve data from table with runtime values in sql?  how to retrieve data from table with runtime values in sql? For example, I have table... value. But I dont know how to retrieve the values whenever i pass different dates
Add values of drop down menu( select option) to mysql table
Add values of drop down menu( select option) to mysql table   Here is my code <?php echo $row['valveName'].'<td>'.$row...($query_auto) or die(mysql_error());42 but $change has a null value
how to display values from database into table using jsp
how to display values from database into table using jsp  I want to display values from database into table based on condition in query, how... the values from database based on the bookname or authorname entered must be display
Query to insert values in the empty fields in the last row of a table in Mysql database?
Query to insert values in the empty fields in the last row of a table in Mysql database?  I have some fields filled and some fields empty in the last row of my MYSQL database. Now I want to fill up those empty fields in the last
How to update table column from the values of Arraylist in java
How to update table column from the values of Arraylist in java  Hii Sir, I have an arraylist containing these values [2, 1, 1, 1, 1, 1, 1... As per my need i have to add these values into different fields of single
PHP NULL Type
PHP NULL type: In PHP 4 a special type of value is introduced, which indicates that a variable does not consists of any value or NULL value. NULL is the only value of NULL datatype. A variable is considered to be NULL if we use unset
how can i store text box values as it is in database table
how can i store text box values as it is in database table  CUSTOMER DESCRIPTION
How to Sort Column values of a jsp table - JSP-Servlet
How to Sort Column values of a jsp table  Hi Friend Please help me. I am displaying reultset values on multiple jsp page. I want to sort selected column values on every page onclick of an event its very urgent pleasehelp
How to display all the Select values from the MySQL database table in where condition= In JSP?
How to display all the Select values from the MySQL database table in where... to display all the select values from MySQL DB** only first value is displayed in the jsp file. @select * from table dept where dept_no=10;" jsp code i have used
Advertisements
 

 

 

DMCA.com