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SQL PRIMARY KEY Constraint
SQL PRIMARY KEY Constraint       The PRIMARY KEY constraint is used to uniquely identifies each... illustrate an example to understand SQL PRIMARY KEY Constraint. In this example, we 

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SQL PRIMARY KEY Constraint
SQL PRIMARY KEY Constraint       The PRIMARY KEY constraint is used to uniquely... The Tutorial illustrate an example to understand SQL PRIMARY KEY Constraint 

SQL Question

difference between a primary key and a unique key?
the primary key constraint cannot accept null values.whereas column holding the unique constraint can accept null values. Both primary key and unique...difference between a primary key and a unique key?  What's 

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primary key and unique key
primary key and unique key  Whats is mean by primary key and unique key 

SQL Question

primary key and unique key
primary key and unique key  hello, What's the difference between a primary key and a unique key?   hii, Unique key: column restricts entry of duplicate values but entry of null values is allowed. Primary key 

JDBC Questions

crud operations with foreign key constraint.
crud operations with foreign key constraint.  I neeed to know how to perform crud operations in mysql with foreign key constraint using mvc architecture i.e using servlet jsp and bean. please provide all the code so that i can 

SQL Question

What is a "primary key"?
What is a "primary key"?  What is a "primary key"?   Hi, Here is the answer, A primary key is used to uniquely identify each row... be an artificial field (one that has nothing to do with the actual record). A primary key can 

Hibernate Questions

composinte primary key in hibernate
composinte primary key in hibernate  I am facing following problem, Inside the database(mssql), i have created a table without primary key... primary key with all the columns of the table and hibernate s/w has created two pojo 

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Mysql Alter Constraint
;  A constraint is a property in SQL assigned to a column or the set... Key constraint. ALTER TABLE userform ADD ID INT NOT NULL AUTO_INCREMENT FIRST, ADD PRIMARY KEY (ID); After alter the table "userform" 

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Adding A Primary Key to an Existing Table
Adding A Primary Key to an Existing Table   Been trying to add a primary key to a MySQL table using Java for two days with no success. I'm new... KEY (SerialNo)"); out.println("Primary key added 

Hibernate Questions

Create primary key using hibernate
Create primary key using hibernate  How to create primary key using hibernate?   The id element describes the primary key for the persistent class and how the key value is generated.   <id name="id 

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SQL Alter Table Primary Key
SQL Alter Table Primary Key       Alter a Table Primary Key in SQL modifies the existing table and adds a primary key. Create Table Stu_Table SQL statement to create 

SQL Question

changing primary key of parent table
changing primary key of parent table  I want to change one primary key from a table where primary key is auto created? How can I do that? I have... error: You have an error in your SQL syntax; check the manual that corresponds 

JDBC Questions

JDBC insert that returns primary key
JDBC insert that returns primary key  How to write code for jdbc insert that returns primary key? Help me fast Thanks   Hi, Following code can be used: //Add record into database String queryInsert = "insert 

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Mysql add primary key
Mysql add primary key       Mysql add Primary Key is used to add primary key on the column... of this tutorial illustrate an example from 'Mysql Add Primary Key'. To understand 

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Mysql Alter Foreign Key
;  A Foreign Key is a field that marks to the primary key...,  `contact_name` varchar(50) default NULL,  PRIMARY KEY (`publisher_id... of existing table 'books' and add constraint foreign key 'publisher_id and publisher 

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SQL Primary Key
SQL Primary Key       The Primary Key in SQL is used to uniquely identifies each records.... Understand with Example The Tutorial illustrate an example from 'SQL Primary Key 

Hibernate Questions

hibernate annotations with composite primary key
to use hibernate annotations in case of composite primary key in one table. I tried like this, I have created a table without primary key. By default mssql has created a composite primary key with all the columns of the table. table 

SQL Tutorial

Mysql Alter Table Primary Key
Mysql Alter Table Primary Key       Mysql Alter Table Primary Key is used to remove the primary key from the table and add primary key to the existing other column of table 

SQL Question

Difference between not null and primary key in mysql
Difference between not null and primary key in mysql  Explain not null and primary key in mysql 

Hibernate Questions

How to create primary key using hibernate?
How to create primary key using hibernate?  Hi, How to create primary key using hibernate? Thanks 

JDBC Questions

how tohow to create a table with primary key and foreign keyhow to create a table with primary key and foreign key
how tohow to create a table with primary key and foreign keyhow to create a table with primary key and foreign key  how to create a table using java language with primary key and foreign key   Hi Friend, A foreign 

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Mysql Alter Column Primary Key
Mysql Alter Column Primary Key       Mysql Alter Column Primary Key is used to modify table and redefine the Primary Key Column in a table. Understand with Example 

JSP Servlet Questions

How to auto increment primary key in mysql...
How to auto increment primary key in mysql...  How to auto increment primary key in mysql... and one more thing i need to get auto increment value in front end each time for inserting the value[JSP 

SQL Question

query regarding auto increment primary key
query regarding auto increment primary key  i want to use s1,s2.... as my auto increment primary key.cant i do this in mysql 

Hibernate Questions

Define sequence generated primary key in hibernate
Define sequence generated primary key in hibernate  How to define sequence generated primary key in hibernate?   Use value "sequence" for class attribute for generator tag. <id column="USER_ID" name="id" type 

SQL Tutorial

SQL Alter Table Primary Key tutorial
SQL Alter Table Primary Key       Alter a Table Primary Key in SQL modifies the existing table and adds a primary key. Create Table Stu_Table SQL statement to create 

JSP Servlet Questions

inserting into mysql database with uid to be primary key and autoincrement
inserting into mysql database with uid to be primary key and autoincrement  hello, i am new to jsp and facing problem in creating a database entry.... In the database table, set the uid as the primary key and auto-increment. Then, whenever 

Hibernate Questions

hibernate Foreign key
(255) DEFAULT NULL, City varchar(255) DEFAULT NULL, PRIMARY KEY (P_Id...) NOT NULL, OrderNo int(11) NOT NULL, P_Id int(11) DEFAULT NULL, PRIMARY KEY (O_Id), KEY P_Id (P_Id), CONSTRAINT orders_ibfk_1 FOREIGN KEY (P_Id) REFERENCES 

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SQL Auto increment Primary Key
SQL Auto increment Primary Key       SQL Auto increment Primary Key is used to allow a unique... increment Primary Key'. To understand this example we use a query 'use 

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