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foreign key in the sql is to query on the related information aavailable in the table.
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What is the function of an SQL Loader?
The SQL*Loader is used to move files onto the Oracle database, for later access. The SQL*Loader is relatively simple to use and accepts many different types of files.
What does the term foreign key mean in databases?
The foreign key is used as a reference in a table to the primary key of another table. For example: consider a table employee with id(primary key), name, address,department_id(foreign key) as its fields.Another table department with fields department_id(primary key) and dept_name. So, department_id is primary key in department table and foreign key in employee table.
Can a primary key be a foreign key?
Yes, a primary key can also be a foreign key. This is known as a composite key, where one or more columns in a table are both primary keys for that table and also act as foreign keys linking to another table.
What is the condition for a key to be a foreign key?
condition key is a simply one of the open source
What role does a foreign key play in the establishment of a relationship between two entities or tables?
A foreign key is a relationship or link between two tables which ensures that the data stored in a database is consistent.
Why you need primary key and foreign key?
In sql you use primary key more than one column in a table
What is a character function in SQL?
Spongebob
In SQL what is the function of the union operator?
In SQL, the function of the union operator is to combine the result of two or more select-statements. The union operator is a very useful tool when coding SQL.
How to define a user defined function in SQL?
Not possible in SQL, but possible in many vendor-specific SQL-based languages like Oracle PL/SQL.
Will newid in sql generate duplicate key?
no
What does the SQL Max function do?
The "SQL Max function" is a computer programming term, which can be used in spreadsheets to give the highest value from the currently selected column.
What is the function of SQL compare?
SQL compare is used to compare and synchronize data bases.It can be downloaded as a piece of software.Databases can be compared by SQL compare and synchronized.
What is the function of an SQL server replication?
The function of an SQL server replication is to restrict the control that a user has. Limiting these possibilities ensures safety on networks and with untrusted users.
Can composite key has null values?
if you want composite key for using the sql use the following sql query: select distinct(col_name) from table_name where col_name is null;
What are function bus system in the database?
What are the two major components of SQL What function do they serve
What does the replace command perform in SQL?
The replace command function in SQL preforms comparisons on the collation of an input or inputs. It also replaces the text in a string of the SQL server.
What is the function of Microsoft SQL?
SQL is a relational database management system. The very first function of this software is to keep the data safe and retrieve it When it is asked by other software applications.
