Working with columns
Initially, an information object query includes all columns from the information object, as shown in Figure 2-1. A check mark appearing beside a column name in Query indicates that a reference to the column appears in the SELECT statement of the information object query.
To limit the data set that an information object query returns, deselect one or more column names. Deselecting a column name removes the column reference from the SELECT statement in the information object query.

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