Optimising Queries - Series 3 Distinguishing among query types => Point => Multipoint => Range => Prefix match => Extremal => Ordering => Grouping => Join by DR. SUBRAMANI PARAMASIVAM

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Optimising
Queries
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OQ-03 Distinguishing among query types
DR. SUBRAMANI
PARAMASIVAM
(MANI)

2. About
me
Dr. SubraMANI Paramasivam
PhD., MCT, MCSE, MCITP, MCP, MCTS, MCSA
CEO, Principal Consultant & Trainer
@ DAGEOP (UK)
Email: mani@dageop.com
Blog: http://dataap.org/blog
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3. Contents
• OQ-03 Distinguishing among query types
• Point
• Multipoint
• Range
• Prefix match
• Extremal
• Ordering
• Grouping
• Join
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4. OQ-03 Distinguishing among Query Types
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5. Point & Multipoint
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6. Point & Multipoint
• Spatial Data just representing the information about Location and
shape of the geometric objects.
• To locate a particular place, we can use the point with Latitude and
Longitude information.
• There are two spatial data types in SQL Server
• Geometry
• Geography
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7. Point & Multipoint
Syntax for Point
Point (Lat, Long, SRID)
Explanation:
Lat
• Is a float expression representing the x-coordinate of the Point being generated.
Long
• Is a float expression representing the y-coordinate of the Point being generated.
SRID
• Is an int expression representing the SRID of the geography instance you wish to
return.
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8. Point & Multipoint
Syntax
Multipoint (X coordinate, YZ coordinate, SRID)
Example for Multipoint
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9. Point & Multipoint
• What is the purpose of using Point?
Helps to find the distance between the
two cites by using geography point with
lat & long information
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10. DEMO
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11. Range
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12. Range
• In SQL Server we have Range search condition, it will return all values
between two specified values.
• Normally two types of Ranges
• Inclusive Range
• Exclusive Range
• Inclusive Range
• It will use the keyword called “BETWEEN”
• Exclusive Range
• It will use greater than or lesser than
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13. DEMO
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14. Prefix Match & Ordering
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15. Prefix Match & Ordering
• Helps to identify first few character or values of an attribute.
• “Like” operator is used
• ORDER BY is used and will not affect the data.
• ASC
• DESC
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SELECT
FROM
WHERE COL1 LIKE PREFIXCOL1+’%’
ORDER BY LEN(PREFIXCOL1) DESC

16. DEMO
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17. Extremal
• 2 different extremes in a query, it can be Min or Max
• It’s used to find the maximum value of the particular column of the
table or minimum value.
• Syntax:
Min (Column_Name)
Max(Column_Name)
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18. DEMO
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19. Grouping
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20. Grouping
• Helps in grouping the data and helps finding value for a group.
• GROUP BY helps to aggregate other values in a query.
• CUBE and ROLLUP cannot be used without GROUP BY.
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21. DEMO
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22. Joins
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23. Joins
• The SQL Joins is used to combine records from two or more tables.
• Why:
• To collect information with a common key column in tables
• Most commonly used joins are,
• Inner Join
• Outer Join
• Left Outer Join
• Right Outer Join
• Full Outer Join
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24. Joins
Inner Join
• Displays matched results
between two tables
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25. Joins
Left Outer Join:
Matching data from
both table as well as
everything from the table in
LEFT side.
Right Outer Join:
Matching data from
both table as well as
everything from the table in
RIGHT side.
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26. Joins
Full Outer Join
• Renders all the rows from both the tables based on the column used
to join.
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27. DEMO
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28. Review
Distinguishing among query types
Point
Multipoint
Range
Prefix match
Extremal
Ordering
Grouping
Join
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29. Q & A
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30. ®
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