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Snapshot Grain Statement
Snapshot Grain Statements have 2 parts:
• Identifies the Snapshot Period (Daily, Monthly, Quarterly)
• Identifies 1 or more dimensions that will be sampled at the end of each period
Can include Facts that summarize the snapshot period can prevent the need to refer to the
transaction star when working with the snapshot.
Should also be used to store Period-to-Date Measurements.
** Instead of using SQL AVG(), sum up the snapshot values and then divide by the number of
days in the period such as months.
SQL AVG may have an issue if you have a snapshot that excludes zero-valued levels
The grain statement of a star should make it clear whether rows are to be recorded for zero-
valued levels.
For an inventory star, the grain can be stated as End of Day Snapshots of In-Stock Products by
Location. (excludes zero-valued levels)
While a bank will likely want accounts with zero balances to show up on reports.
For a balances star, the grain can be stated as End of Day Snapshots of Accounts by Branch
(includes zero-valued levels)
First Steps Snapshot vs Transaction Grain Statements
First Steps Snapshot vs Transaction Grain Statements
First Steps Snapshot vs Transaction Grain Statements

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First Steps Snapshot vs Transaction Grain Statements

  • 1. Snapshot Grain Statement Snapshot Grain Statements have 2 parts: • Identifies the Snapshot Period (Daily, Monthly, Quarterly) • Identifies 1 or more dimensions that will be sampled at the end of each period Can include Facts that summarize the snapshot period can prevent the need to refer to the transaction star when working with the snapshot. Should also be used to store Period-to-Date Measurements. ** Instead of using SQL AVG(), sum up the snapshot values and then divide by the number of days in the period such as months. SQL AVG may have an issue if you have a snapshot that excludes zero-valued levels The grain statement of a star should make it clear whether rows are to be recorded for zero- valued levels. For an inventory star, the grain can be stated as End of Day Snapshots of In-Stock Products by Location. (excludes zero-valued levels) While a bank will likely want accounts with zero balances to show up on reports. For a balances star, the grain can be stated as End of Day Snapshots of Accounts by Branch (includes zero-valued levels)