what are the different scd types?
['Type 0 – Fixed Dimension. No changes allowed, dimension never changes.', 'Type 1 – No History. Update record directly, there is no record of historical values, only current state.', 'Type 2 – Row Versioning. ... ', 'Type 3 – Previous Value column. ... ', 'Type 4 – History Table. ... ', 'Type 6 – Hybrid SCD.']