Dynamic Column Generation for SQL Pivot Tables

Dynamic pivot tables require the &lexical parameter reference, as it allows for the insertion of variable SQL snippets, which is necessary for the column list in the PIVOT clause. In the example of GL Balances, the PIVOT clause structure is `pivot(sum(amount) for period_name in (&gl_period_pivot))`.

The parameter SQL text needs to generate a comma-separated list of periods, formatted correctly for the PIVOT clause, which typically includes aliases. For instance, if the Period parameter derives the year, the lexical reference might be replaced with: `’Jan-20′ jan_2020, ‘Feb-20’ feb_2020, ‘Mar-20’ mar_2020, …`. The resulting list contains periods from the first of the derived year up to the period indicated in the input parameter.

For the Ledger name restriction, you should use an `n=n` anchor (like `1=1`). In the GL Balance pivot example, the main query includes `where 1 = 1 and gl.ledger_id = gb.ledger_id`. The Ledger restriction parameter would insert its clause at the `1=1` position, while the dynamic period list is inserted at `&gl_period_pivot`.

Yes, for DFFs, you can use the `XXEN_UTIL.DFF_COLUMNS` function. This function returns a SQL text snippet, such as `msiv.attribute15 “Invoice UOM”,` designed to replace an `&lexical` placeholder like `&flexfield_columns` in your main `SELECT` statement. This ensures the column names use the DFF’s form left prompt as the alias.