MySQL
SQL for MySQL (I)
Salim
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Summary
•Retrieving Data Using the SQL SELECT Statement
•Restricting and Sorting Data
•Using Single-Row Functions to Customize Output
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SELECT COMMON PATTERN
SELECT
FROM
WHERE
AND/OR
GROUP BY
HAVING
ORDER BY
<*, Field 1,….., Field n, Aggregate Function>
< Table Name>
<Condition>
<If any additional condition>
<Field 1,……, Field n>
<Condition>
<Field1,…., Field n>
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Retrieving Data Using the SQL SELECT Statement
•Select All Columns
Syntax
Sample
: SELECT * FROM <Table Name>;
: SELECT * FROM ti3k_item_master
•Select Specific Columns
Syntax
Sample
: SELECT <Column Name, Column Name, Column Name,……Column Name>
FROM <Table Name>;
: SELECT item_id, item_name, item_uom
FROM ti3k_item_master;
•Use Arithmetic Operators
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Retrieving Data Using the SQL SELECT Statement
•Understand Operator Precedence
Precedence defines the order that Oracle uses when evaluating different operators in the same expression.
Every operator has a predefined precedence. Oracle evaluates operators with a higher precedence before it
evaluates operators with a lower precedence. Operators with equal precedence will be evaluated from left to
right
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Restricting and Sorting Data
•Write queries that contain a WHERE clause to limit the output
retrieved
Syntax
Sample
: Select <Column Name,……Column Name>
From <Table Name>
Where <Column Name or Logical Phrase>;
: SELECT item_id, item_name, item_uom
FROM ti3k_item_master
Where item_uom ='Set';
•Write queries that contain an ORDER BY clause sort the output of a
SELECT statement (Ascending or Descending)
Sample
: Select * from ti3k_item_master
Order by item_uom asc;
Sample
: Select * from ti3k_item_master
Order by item_id desc;
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Restricting and Sorting Data
List the comparison operators and logical operators that are used in
a WHERE clause
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Sample SELECT with WHERE using Comparison operators
Exercise:
select item_uom “UOM” from ti3k_item_master
where item_code =‘DRL10’;
select item_id, item_code, item_name, item_uom, remark
From ti3k_item_master
where item_id > 50
And item_uom =‘Each’;
select * from ti3k_item_master
where item_uom in (‘Sax’,’Set’)
Order by item_uom, item_id;
select * from ti3k_item_master
where remark is null
Or created_by = ‘Salim’;
select * from ti3k_item_master
where item_id between 10 and 20;
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