OBIEE Date Expressions(using timestampadd)

    In OBIEE, You can use TIMESTAMPADD function to add an interval to a date.

            First Day of the CURRENT Month:

TIMESTAMPADD(SQL_TSI_DAY, -1,TIMESTAMPADD(SQL_TSI_MONTH,1,TIMESTAMPADD(SQL_TSI_DAY,1,TIMESTAMPADD(SQL_TSI_DAY, DAYOFMONTH(CURRENT_DATE)*-1, CURRENT_DATE))))

·        Last Day of Current Month

TIMESTAMPADD( SQL_TSI_DAY , -(1), TIMESTAMPADD( SQL_TSI_MONTH , 1, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))

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·        First Day of the Previous Month

TIMESTAMPADD(SQL_TSI_MONTH, -1, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE))

·        Last Day of the Previous Month

TIMESTAMPADD( SQL_TSI_DAY , -(1), TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE))

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·        First Day of the Next Month

TIMESTAMPADD(SQL_TSI_MONTH, 1, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE))

·        Last Day of the Next Month

TIMESTAMPADD( SQL_TSI_DAY , -(1), TIMESTAMPADD( SQL_TSI_MONTH , 2, TIMESTAMPADD( SQL_TSI_DAY , DAYOFMONTH( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))

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·        First Day of the Current Year

TIMESTAMPADD( SQL_TSI_DAY , EXTRACT( DAY_OF_YEAR FROM CURRENT_DATE) * -(1) + 1, CURRENT_DATE)

·        Last Day of Current Year

TIMESTAMPADD(SQL_TSI_YEAR, 1, TIMESTAMPADD( SQL_TSI_DAY , -1, TIMESTAMPADD( SQL_TSI_DAY , EXTRACT( DAY_OF_YEAR FROM CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))

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·        First Day of the Previous Year

TIMESTAMPADD( SQL_TSI_YEAR , -1, TIMESTAMPADD( SQL_TSI_DAY , EXTRACT( DAY_OF_YEAR FROM CURRENT_DATE) * -(1) + 1, CURRENT_DATE))

·        Last Day of Previous Year

TIMESTAMPADD( SQL_TSI_DAY , -1, TIMESTAMPADD( SQL_TSI_DAY , EXTRACT( DAY_OF_YEAR FROM CURRENT_DATE) * -(1) + 1, CURRENT_DATE))

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·        First Day of the Next Year

TIMESTAMPADD( SQL_TSI_YEAR , 1, TIMESTAMPADD( SQL_TSI_DAY , EXTRACT( DAY_OF_YEAR FROM CURRENT_DATE) * -(1) + 1, CURRENT_DATE))

·        Last Day of the Next Year

TIMESTAMPADD(SQL_TSI_YEAR, 2, TIMESTAMPADD( SQL_TSI_DAY , -1, TIMESTAMPADD( SQL_TSI_DAY , EXTRACT( DAY_OF_YEAR FROM CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))

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·        First Day of Current Quarter

TIMESTAMPADD( SQL_TSI_DAY , DAY_OF_QUARTER( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)

·        Last Day of Current Quarter

TIMESTAMPADD( SQL_TSI_DAY , -(1), TIMESTAMPADD( SQL_TSI_QUARTER , 1, TIMESTAMPADD( SQL_TSI_DAY , DAY_OF_QUARTER( CURRENT_DATE) * -(1) + 1, CURRENT_DATE)))

Degenerate Dimension

A degenerate dimension is a dimension that is stored in a fact table or data that is dimensional in nature but stored in a fact table. There may be more than one degenerate dimension inside a fact table.

Ex: 

dimension attributes such as invoice number,order number,invoice id  present in fact table can all be classified as degenerate dimensions.