06.01 sql select distinct
TRANSCRIPT
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SQL SELECT DISTINCT
Statement
In a table, some of the columns may contain
duplicate values. This is not a problem,
however, sometimes you will want to list only
the different (distinct) values in a table.
The DISTINCT keyword can be used to return
only distinct (different) values.
SQL SELECT DISTINCT Syntax
SELECT DISTINCT column_name(s)
FROM table_name
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SELECT DISTINCT Person.PName
FROM Person;
Id Name Address Hobby
1123 Anita Damauli stamps
1123 Anita Damauli coins
5556 BinodKathmand
u hiking
9876 BarshaKathmand
u stamps
PName
Anita
Barsha
Binod
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SQL AND & OR Operators
The AND & OR operators are used to filter
records based on more than one condition
The AND operator displays a record if both the
first condition and the second condition are
true.
The OR operator displays a record if either the
first condition or the second condition is true.
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SQL OR Operators
SELECT * FROM Person
WHERE Person.Hobby='hiking' OR
Person.ID>3000;
ID PName Address Hobby
5556 Binod Kathmandu hiking
9876 Barsha Kathmandu stamps
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SQL AND Operators
SELECT *
FROM Person
WHERE Person.ID>3000 AND Person.ID<5999;
ID PName Address Hobby
5556 Binod Kathmandu hiking
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SQL ORDER BY
The ORDER BY keyword is used to sort the
result-set.
The ORDER BY keyword is used to sort the
result-set by a specified column.
The ORDER BY keyword sorts the records in
ascending order by default.
If you want to sort the records in a descending
order, you can use the DESC keyword.
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SQL ORDER BY Syntax
SELECT column_name(s)
FROM table_name
ORDER BY column_name(s) ASC|DESC
SELECT Person.Hobby
FROM Person
ORDER BY Person.Hobby;
Hobby
coins
hiking
stamps
stamps
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SQL INSERT INTO
The INSERT INTO statement is used to insert a new row in a table.
SQL INSERT INTO Syntax
It is possible to write the INSERT INTO statement in two forms.
The first form doesn't specify the column names where the data will be inserted, only their values:INSERT INTO table_name VALUES (value1, value2,
value3,...)
The second form specifies both the column names and the values to be inserted:INSERT INTO table_name (column1, column2, column3,...)
VALUES (value1, value2, value3,...)
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SQL INSERT INTO
INSERT INTO Persons
VALUES (4,'Nilsen', 'Johan', 'Bakken 2',
'Stavanger')
INSERT INTO Persons (P_Id, LastName,
FirstName)
VALUES (5, 'Tjessem', 'Jakob')
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SQL UPDATE
The UPDATE statement is used to update existing records in a table.
SQL UPDATE Syntax:
UPDATE table_nameSET column1=value, column2=value2,...WHERE some_column=some_value
Example:
UPDATE PersonsSET Address=‘Nayabazar', City=‘Kathmandu'WHERE LastName=‘Ghimire' AND FirstName=‘Bishal'
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SQL UPDATE Warning
Be careful when updating records. If we had
omitted the WHERE clause in the example
above, like this:
UPDATE Persons
SET Address=‘Nayabazar', City=‘Kathmandu‘
What will be the result ?
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SQL DELETE
The DELETE statement is used to delete rows
in a table.
SQL DELETE Syntax
DELETE FROM table_name
WHERE some_column=some_value
DELETE FROM Persons
WHERE Address=‘Nayabazar', City=‘Kathmandu‘
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SQL TOP
The TOP clause is used to specify the number of records to return.
The TOP clause can be very useful on large tables with thousands of records. Returning a large number of records can impact on performance.
Note: Not all database systems support the TOP clause.
SQL Server Syntax
SELECT TOP number|percent column_name(s)FROM table_name
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SQL TOP
MySQL Syntax
SELECT column_name(s)FROM table_nameLIMIT number
Oracle Syntax
SELECT column_name(s)FROM table_nameWHERE ROWNUM <= number
SELECT * FROM Persons LIMIT 5
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SQL LIKE
The LIKE operator is used to search for a
specified pattern in a column.
SQL LIKE Syntax
SELECT column_name(s)
FROM table_name
WHERE column_name LIKE pattern
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SQL LIKE
To select the persons living in a city that starts
with "s" from the table.
SELECT * FROM Persons
WHERE City LIKE ‘k%'
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SQL Wildcards
Wildcard Description
% A substitute for zero or more characters
_ A substitute for exactly one character
[charlist] Any single character in charlist
[^charlist]or
[!charlist]
Any single character not in charlist
• SQL wildcards can substitute for one or more
characters when searching for data in a
database.
• SQL wildcards must be used with the SQL
LIKE operator.
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SQL IN
The IN operator allows you to specify multiple
values in a WHERE clause.
SQL IN Syntax
SELECT column_name(s)
FROM table_name
WHERE column_name IN (value1,value2,...)
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Example #1
Select *
From Address
Where FirstName IN ('Mary', 'Sam')
Example #2
SELECT *
FROM Address
WHERE FirstName = 'Mary'
OR FirstName = 'Sam'
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SQL BETWEEN
The BETWEEN operator selects a range of
data between two values. The values can be
numbers, text, or dates.
SQL BETWEEN Syntax
SELECT column_name(s)
FROM table_name
WHERE column_name
BETWEEN value1 AND value2
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Example:
SELECT * FROM suppliers WHERE supplier_id
BETWEEN 5000 AND 5010;
SELECT * FROM suppliers WHERE supplier_id
>= 5000 AND supplier_id <= 5010;
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example:
SELECT * FROM orders WHERE order_date
between to_date ('2013/01/01', 'yyyy/mm/dd')
AND to_date ('2013/12/31', 'yyyy/mm/dd');
SELECT * FROM orders WHERE order_date >=
to_date('2013/01/01', 'yyyy/mm/dd') AND
order_date <=
to_date('2013/12/31','yyyy/mm/dd');