Difference between revisions of "SYNCNUM()"

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m (SYNCNUM moved to SYNCNUM())
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''Note: The SYNCNUM Pseudo Column has been replaced with the SYNCNUM() function.''
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==Purpose==
 
==Purpose==
Return the unique sequence number assigned to a row from the specified table
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Function to return the unique sequence number assigned to a row from the specified table
  
  
 
==Syntax==
 
==Syntax==
SYNCNUM
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SYNCNUM()
  
  
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==Description==
 
==Description==
A Pseudo Column behaves like a table column, but is not actually stored in the table. You can select from Pseudo Columns, but they cannot be updated.  Pseudo Columns provide extra information about a SELECT row set.
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The SYNCNUM() function returns the unique sequence number assigned to a row from the specified table. Each new row inserted into a table will be assigned a unique sequence number for that table. Even if the row is deleted later or if all the rows are deleted from the table, that number will not be issued again.
 
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The SYNCNUM pseudo column will return the unique sequence number assigned to a row from the specified table. Each new row inserted into a table will be assigned a unique sequence number for that table. Even if the row is deleted later or if all the rows are deleted from the table, that number will not be issued again.
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// Display all overdue accounts with 15% commission in
 
// Display all overdue accounts with 15% commission in
 
// Sorted "name" and "paid date" order with the unique row sequence number.
 
// Sorted "name" and "paid date" order with the unique row sequence number.
EXEC SQL
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OPEN DATABASE southwind
SELECT SYNCNUM, name, address, balance, cost*1.15
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SELECT syncnum(), recno() FROM example
FROM accounts
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WHERE paid_date < date()
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ORDER BY name, paid_date;
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</code>
 
</code>
  
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[[Category:Documentation]]
 
[[Category:Documentation]]
 
[[Category:SQL]]
 
[[Category:SQL]]
[[Category:Pseudo Columns]]
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[[Category:Functions]]

Revision as of 15:12, 4 July 2011

Note: The SYNCNUM Pseudo Column has been replaced with the SYNCNUM() function.

Purpose

Function to return the unique sequence number assigned to a row from the specified table


Syntax

SYNCNUM()


See Also

INSERT, Optimizing Indexes using SYNCNUM, PSEUDO COLUMNS, SELECT, UPDATE


Description

The SYNCNUM() function returns the unique sequence number assigned to a row from the specified table. Each new row inserted into a table will be assigned a unique sequence number for that table. Even if the row is deleted later or if all the rows are deleted from the table, that number will not be issued again.


Example

// Display all overdue accounts with 15% commission in
// Sorted "name" and "paid date" order with the unique row sequence number.
OPEN DATABASE southwind
SELECT syncnum(), recno() FROM example


Products

Recital, Recital Server