Select
Kalipso - Form - Actions - Actions Description - Group Database - Select
Selects one or more records from the specified Database Table.
Action available for the following operating systems:
Parameters
SELECT
From - Database Table where to retrieve the records from.
Function - Function applied to the specified column. For further information about this parameter, please consult the documentation of your Database or SQLite if you're working off-line.
AVG - Returns the average value of the specified Column.
COUNT - Returns the number of records.
MAX - Returns the maximum value of the specified Column.
MIN - Returns the minimum value of the specified Column.
SUM - Returns the sum of the values of the specified Column.
Column - Column to be retrieved.
Into <target> - Control or Variable where to store the retrieved value.
Nth From - Table where to retrieve the records from.
Nth Function <unquoted string> - Function applied to the specified column. For further information about this parameter, please consult the documentation of your Database or SQLite if you're working off-line.
Nth Column <unquoted string> - Column to be retrieved.
Nth Into <unquoted string> - Control or Variable where to store the retrieved value.
Ignore Database Masks - If you've defined a Mask for the specified Column in the Table properties and:
This option is checked - The value is return the Kalipso format.
This option is unchecked - The value is returned with the Mask format.
Clear Data When No Record is Returned - If this option is checked and no record is returned, all the targets (Into parameter) are cleared.
Where <Kalipso Filter> or <string> - Condition to specify which records should be retrieved. Check Expressions chapter for more information about Kalipso Filter and String expressions.
Usage
This function generates a Select operation that exists in every SQL database, and is used to query the database and retrieve data according to one ore more conditions.
Consider the following Database Table, and the following Variables:
Products
Code
Name
Stock
1
Coca Cola
100
2
Pepsi Cola
200
3
Pork Chops
300
Code
Name
Stock
VAR(0)
String
Kalipso
VAR(1)
Numeric
0
VAR(2)
String
Kalipso1
Consider that column Code is Numeric, column Name is String and column Stock is Numeric. Note that the table showing variables isn't a database table, its purpose is to show only the values and type of each variable.
Example 1
From
Function
Column
Into
Products
<none>
Code
VAR(0)
Products
<none>
Name
VAR(1)
Products
<none>
Stock
VAR(2)
Where
FIELD(Products,Code)=001
Clear Data
Yes
Result:
Variable
Type
Value
VAR(0)
String
1
VAR(1)
Numeric
Coca Cola
VAR(2)
String
100
Example 2
From
Function
Column
Into
Products
AVG
Code
VAR(0)
Products
<none>
Name
VAR(1)
Products
SUM
Stock
VAR(2)
Where
FIELD(Products,Code)=004
Clear Data
Yes
Result:
Variable
Type
Value
VAR(0)
Numeric
VAR(1)
String
VAR(2)
Numeric
Example 3
From
Function
Column
Into
Products
<none>
Code
VAR(0)
Products
<none>
Name
VAR(1)
Products
<none>
Stock
VAR(2)
Where
FIELD(Products,Code)=004
Clear Data
No
Result:
Variable
Type
Value
VAR(0)
String
kalipso
VAR(1)
Numeric
0
VAR(2)
String
kalipso1
Example 4
From
Function
Column
Into
Products
AVG
Code
VAR(0)
Products
<none>
Name
VAR(1)
Products
SUM
Stock
VAR(2)
Where
FIELD(Products,Code)=004
Clear Data
No
Result:
Variable
Type
Value
VAR(0)
Numeric
VAR(1)
String
VAR(2)
Numeric
Example 5
From
Function
Column
Into
Products
SUM
Stock
VAR(2)
Where
FIELD(Products,Code)<>0
Clear Data
Yes
Result:
Variable
Type
Value
VAR(0)
String
kalipso
VAR(1)
Numeric
0
VAR(2)
Numeric
600
Example 6
From
Function
Column
Into
Products
MIN
Code
VAR(0)
Products
COUNT
Name
VAR(1)
Products
SUM
Stock
VAR(2)
Where
FIELD(Products,Code)<> ""
Clear Data
No
Result:
Variable
Type
Value
VAR(0)
Numeric
1
VAR(1)
String
3
VAR(2)
Numeric
600
Notice that, as you can see in the examples above, Variable types are enforced, except if there is no result of the select operation and parameter Clear Data isn't checked.
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