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1 If the column you want represented in your pivot table does not already exist in the source data worksheet, you will need to insert a column by right clicking on an existing column and choosing Insert Column from the popup menu.  If you added a column to your source data, populate that column with the relevant data.
When you add a new column to the table, PostgreSQL appends it at the end of the table. PostgreSQL has no option to specify the position of the new column in the table. To add multiple columns to an existing table, you use multiple ADD COLUMN clauses in the ALTER TABLE statement as follows: 1.