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%d
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- substitute a data value from a record in an SQL query
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%h
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- substitute the column heading from an SQL query
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%n(...%)
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- include text only if a data value is not NULL
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%[!...%]
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- include text only when data differs from the previous record
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%n[@...%]
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- store a data value to a file
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%n[^...%]
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- include text every nth line
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