Non cluster index , SQL Server Table

Non cluster index , SQL Server Table 

CREATE NONCLUSTERED INDEX IDX_tblppd_data_P03 

    ON tblppd_data ( PPD_LT, PPD_Period, PPD_Period_Source

); 

https://docs.microsoft.com/en-us/sql/relational-databases/indexes/create-nonclustered-indexes?view=sql-server-ver15