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The SQL CHECK CONSTRAINT ensures that a value for a
specific column or columns have satisfied a specified
condition.
The job of CHECK constraint is, to limit the values for a
column of a table. ....
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W3resource at 03:17:50 PM 6th February 2012 |
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The SQL FOREIGN KEY CONSTRAINT is used to ensure the
referential integrity of the data in one table to match
values in another table.
The FOREIGN KEY CONSTRAINT is a column or list of columns
which points to the PRIMARY KEY of another table. ....
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The SQL PRIMARY KEY is a column in a table which must
contain a unique value which can be used to identify each
and every row of a table uniquely.
However, SQL supports primary keys directly with the PRIMARY
KEY constraint. ....
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The SQL UNIQUE constraint is used to ensure that the each
rows for a column have different value. In this page we are
going to discuss, how the SQL UNIQUE CONSTRAINT works if it
is used at the end of the CREATE TABLE statement instead of
using the UNIQUE CONSTRAINT....
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The SQL CONSTRAINTS are an integrity which defines some
conditions that restricts the column to remain true while
inserting or updating or deleting data in the column.
Constraints can be specified when the table created first
with CREATE TABLE statement or at the time of modification
of structure of an....
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Tables are a basic unit of organization and storage of data
in SQL. Each table has an name such as a author, book_mast,
purchase or orders. A table is similar to a file in a
non-database system.
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In Sql, the create database statement is used to create a
database.
The database names are case sensitive in Unix but this
restriction does not apply in Windows. This is also true for
table names. The best practice is to use same letter case
while creating database as well as tables.....
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The FULL OUTER JOIN will return all rows, as long as
there's matching data in one of the tables. It includes all
the rows from both the participating tables and does not
select either the LEFT or RIGHT table from the JOIN key
word. ....
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The SQL Right Join or simply RIGHT JOIN return all rows
from the first table listed after the JOIN keyword , no
matter if they have matches in the left table of the JOIN
keyword.
This means that if the ON clause matches no records in the
left table of JOIN....
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The SQL Left Join or simply LEFT JOIN return all rows from
the first table listed after the FROM clause or left of JOIN
keyword , no matter if they have matches in the right table
of the JOIN keyword.
This means that if the ON clause matches no records in....
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