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Selects one or more records from the specified Database Table.
Parameters
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| SELECT |
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From |
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Database Table where to retrieve the records from. |
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Function |
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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.
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 AVG
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–
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Returns the average value of the specified Column.
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COUNT
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Returns the number of records.
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MAX
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Returns the maximum value of the specified Column.
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MIN
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–
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Returns the minimum value of the specified Column.
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SUM
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–
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Returns the sum of the values of the specified Column.
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Column |
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Column to be retrieved. |
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Into <target> |
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Control or Variable where to store the retrieved value. |
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(...) |
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Nth From |
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Table where to retrieve the records from. |
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Nth Function <unquoted string> |
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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. |
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Nth Column <unquoted string> |
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Column to be retrieved. |
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Nth Into <unquoted string> |
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Control or Variable where to store the retrieved value. |
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| Ignore Database Masks |
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If you've defined a Mask for the specified Column in the Table properties and:
This option is checked
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-
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The value is return the Kalipso format.
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This option is unchecked
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The value is returned with the Mask format. |
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| Clear Data When No Record is Returned |
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If this option is checked and no record is returned, all the targets (Into parameter) are cleared. |
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| Where <Kalipso Filter> or <string> |
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Condition to specify which records should be retrieved. Check Expressions chapter for more information about Kalipso Filter and String expressions. |
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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 |
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| Code |
Name |
Stock |
| VAR(0) |
String |
Kalipso |
| VAR(1) |
Numeric |
0 |
| VAR(2) |
String |
Kalipso1 |
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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.
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Example 1
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Example 2
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| From |
Function |
Column |
Into |
| Products |
<none> |
Code |
VAR(0) |
| Products |
<none> |
Name |
VAR(1) |
| Products |
<none> |
Stock |
VAR(2) |
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| 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 |
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| From |
Function |
Column |
Into |
| Products |
AVG |
Code |
VAR(0) |
| Products |
<none> |
Name |
VAR(1) |
| Products |
SUM |
Stock |
VAR(2) |
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| Where |
FIELD(Products,Code)=004 |
| Clear Data |
Yes |
Result:
| Variable |
Type |
Value |
| VAR(0) |
Numeric |
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| VAR(1) |
String |
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| VAR(2) |
Numeric |
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Example 3
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Example 4
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| From |
Function |
Column |
Into |
| Products |
<none> |
Code |
VAR(0) |
| Products |
<none> |
Name |
VAR(1) |
| Products |
<none> |
Stock |
VAR(2) |
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| Where |
FIELD(Products,Code)=004 |
| Clear Data |
No |
Result:
| Variable |
Type |
Value |
| VAR(0) |
String |
kalipso |
| VAR(1) |
Numeric |
0 |
| VAR(2) |
String |
kalipso1 |
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| From |
Function |
Column |
Into |
| Products |
AVG |
Code |
VAR(0) |
| Products |
<none> |
Name |
VAR(1) |
| Products |
SUM |
Stock |
VAR(2) |
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| Where |
FIELD(Products,Code)=004 |
| Clear Data |
No |
Result:
| Variable |
Type |
Value |
| VAR(0) |
Numeric |
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| VAR(1) |
String |
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| VAR(2) |
Numeric |
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Notes: In this example, the option Clear Data is disabled but are used functions AVG and SUM , and because of that, this operation return on record, therefore types are enforced.
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Example 5
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Example 6
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| From |
Function |
Column |
Into |
| Products |
SUM |
Stock |
VAR(2) |
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| Where |
FIELD(Products,Code)<>0 |
| Clear Data |
Yes |
Result:
| Variable |
Type |
Value |
| VAR(0) |
String |
kalipso |
| VAR(1) |
Numeric |
0 |
| VAR(2) |
Numeric |
600 |
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| From |
Function |
Column |
Into |
| Products |
MIN |
Code |
VAR(0) |
| Products |
COUNT |
Name |
VAR(1) |
| Products |
SUM |
Stock |
VAR(2) |
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| Where |
FIELD(Products,Code)<> "" |
| Clear Data |
No |
Result:
| Variable |
Type |
Value |
| VAR(0) |
Numeric |
1 |
| VAR(1) |
String |
3 |
| VAR(2) |
Numeric |
600 |
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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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- When you specify more than one condition in Where parameter, the operator used between the conditions is "AND" or "OR".
- You can use the RECORDCOUNT Keyword to know how many records where returned.
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Updated: 4/8/2016 9:21 AM
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