-122   COLUMN OR EXPRESSION IN THE SELECT LIST IS NOT VALID

The SELECT statement contains one of these errors:

• The statement contains a column name and an aggregate function in the SELECT clause, but no GROUP BY clause.
• A column name is contained in the SELECT clause (possibly within a scalar function) but not in the GROUP BY clause. Grouping expressions can be used in a SELECT list. A grouping expression specifies only one value for each group. A grouping expression that is specified in this context must exactly match a grouping expression that is specified in the GROUP BY clause, except that blanks are not significant.
  Attention: A HAVING clause specified without a GROUP BY clause implies a GROUP BY with no columns. Thus, no column names are allowed in the SELECT clause.
• An expression is specified in the SELECT clause but not in the GROUP BY clause.
• A sort-key-expression was specified in the ORDER BY clause, the result table contains grouped data, but the select-clause and ORDER BY clause contain a mixture of grouped data and non-grouped data. Grouping expressions can be used in a sort-key-expression of an ORDER BY clause. A grouping expression specifies only one value for each group. A grouping expression that is specified in this context must exactly match a grouping expression that is specified in the GROUP BY clause, except that blanks are not significant.