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Eric Harmeling
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Merge pull request #5669 from cockroachdb/window-frame-definition
Window frame docs
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‎_includes/v19.2/sql/diagrams/opt_frame_clause.html‎

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‎_includes/v19.2/sql/diagrams/window_definition.html‎

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‎v19.2/select-clause.md‎

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`WHERE a_expr` | Only retrieve rows that return `TRUE` for `a_expr`, which must be a [scalar expression](scalar-expressions.html) that returns Boolean values using columns (e.g., `<column> = <value>`).
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`GROUP BY a_expr` | When using [aggregate functions](functions-and-operators.html#aggregate-functions) in `target_elem` or `HAVING`, list the column groupings after `GROUP BY`.
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`HAVING a_expr` | Only retrieve aggregate function groups that return `TRUE` for `a_expr`, which must be a [scalar expression](scalar-expressions.html) that returns Boolean values using an aggregate function (e.g., `<aggregate function> = <value>`). <br/><br/>`HAVING` works like the `WHERE` clause, but for aggregate functions.
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`WINDOW window_definition_list` | A list of [window functions definitions](window-functions.html).
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`WINDOW window_definition_list` | A list of [window definitions](window-functions.html#window-definitions).
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## Eliminate duplicate rows
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