diff --git a/src/test/kotlin/kestrel/ParserTest.kt b/src/test/kotlin/kestrel/ParserTest.kt
index a417fad..0ccccf2 100644
--- a/src/test/kotlin/kestrel/ParserTest.kt
+++ b/src/test/kotlin/kestrel/ParserTest.kt
@@ -1284,4 +1284,177 @@ class ParserTest {
         ) as SelectStatement
         val windows = (statement.projection as ExpressionProjection).items.map { it.expression as WindowExpression }
         assertEquals(WindowFunctionKind.FirstValue, windows[0].kind)
+        assertEquals(WindowFunctionKind.LastValue, windows[1].kind)
+        assertEquals(WindowFunctionKind.Ntile, windows[2].kind)
+        assertEquals(LiteralExpression(Value.IntegerValue(4)), windows[2].argument)
+    }
+
+    @Test
+    fun lagWithNoArgumentsFailsToParse() {
+        assertFailsWith<ParseException> { parseOne("SELECT LAG() OVER (ORDER BY id) FROM users") }
+    }
+
+    @Test
+    fun lagWithFourArgumentsFailsToParse() {
+        assertFailsWith<ParseException> { parseOne("SELECT LAG(salary, 1, 0, 9) OVER (ORDER BY id) FROM users") }
+    }
+
+    @Test
+    fun firstValueWithTwoArgumentsFailsToParse() {
+        assertFailsWith<ParseException> { parseOne("SELECT FIRST_VALUE(salary, id) OVER (ORDER BY id) FROM users") }
+    }
+
+    @Test
+    fun ntileWithNoArgumentsFailsToParse() {
+        assertFailsWith<ParseException> { parseOne("SELECT NTILE() OVER (ORDER BY id) FROM users") }
+    }
+
+    @Test
+    fun parsesExplicitRowsBetweenFrameWithLiteralOffsets() {
+        val statement = parseOne(
+            "SELECT SUM(salary) OVER (ORDER BY id ROWS BETWEEN 1 PRECEDING AND 2 FOLLOWING) FROM users"
+        ) as SelectStatement
+        val window = (statement.projection as ExpressionProjection).items.single().expression as WindowExpression
+        val frame = window.frame!!
+        assertEquals(FrameBoundType.Preceding, frame.start.type)
+        assertEquals(LiteralExpression(Value.IntegerValue(1)), frame.start.offset)
+        assertEquals(FrameBoundType.Following, frame.end.type)
+        assertEquals(LiteralExpression(Value.IntegerValue(2)), frame.end.offset)
+    }
+
+    @Test
+    fun parsesUnboundedAndCurrentRowFrameBounds() {
+        val statement = parseOne(
+            "SELECT SUM(salary) OVER (ORDER BY id ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) FROM users"
+        ) as SelectStatement
+        val window = (statement.projection as ExpressionProjection).items.single().expression as WindowExpression
+        val frame = window.frame!!
+        assertEquals(FrameBoundType.UnboundedPreceding, frame.start.type)
+        assertNull(frame.start.offset)
+        assertEquals(FrameBoundType.CurrentRow, frame.end.type)
+        assertNull(frame.end.offset)
+    }
+
+    @Test
+    fun rowsShorthandWithoutBetweenEndsAtCurrentRow() {
+        val statement = parseOne(
+            "SELECT SUM(salary) OVER (ORDER BY id ROWS 2 PRECEDING) FROM users"
+        ) as SelectStatement
+        val window = (statement.projection as ExpressionProjection).items.single().expression as WindowExpression
+        val frame = window.frame!!
+        assertEquals(FrameBoundType.Preceding, frame.start.type)
+        assertEquals(LiteralExpression(Value.IntegerValue(2)), frame.start.offset)
+        assertEquals(FrameBoundType.CurrentRow, frame.end.type)
+    }
+
+    @Test
+    fun rowsShorthandWithUnboundedFollowingFailsBecauseItWouldStartAfterCurrentRow() {
+        assertFailsWith<ParseException> {
+            parseOne("SELECT SUM(salary) OVER (ORDER BY id ROWS UNBOUNDED FOLLOWING) FROM users")
+        }
+    }
+
+    @Test
+    fun frameStartAfterFrameEndFailsToParse() {
+        assertFailsWith<ParseException> {
+            parseOne("SELECT SUM(salary) OVER (ORDER BY id ROWS BETWEEN CURRENT ROW AND 1 PRECEDING) FROM users")
+        }
+    }
+
+    @Test
+    fun frameWithoutBetweenOrBoundFailsToParse() {
+        assertFailsWith<ParseException> {
+            parseOne("SELECT SUM(salary) OVER (ORDER BY id ROWS) FROM users")
+        }
+    }
+
+    @Test
+    fun windowWithNoFrameLeavesFrameNull() {
+        val statement = parseOne("SELECT SUM(salary) OVER (ORDER BY id) FROM users") as SelectStatement
+        val window = (statement.projection as ExpressionProjection).items.single().expression as WindowExpression
+        assertNull(window.frame)
+    }
+
+    @Test
+    fun parsesExplicitRangeBetweenFrameWithLiteralOffsets() {
+        val statement = parseOne(
+            "SELECT SUM(salary) OVER (ORDER BY amount RANGE BETWEEN 5 PRECEDING AND 10 FOLLOWING) FROM users"
+        ) as SelectStatement
+        val window = (statement.projection as ExpressionProjection).items.single().expression as WindowExpression
+        val frame = window.frame!!
+        assertEquals(FrameUnit.Range, frame.unit)
+        assertEquals(FrameBoundType.Preceding, frame.start.type)
+        assertEquals(LiteralExpression(Value.IntegerValue(5)), frame.start.offset)
+        assertEquals(FrameBoundType.Following, frame.end.type)
+        assertEquals(LiteralExpression(Value.IntegerValue(10)), frame.end.offset)
+    }
+
+    @Test
+    fun rangeShorthandWithoutBetweenEndsAtCurrentRowAndDefaultsRowsUnitOtherwise() {
+        val rangeStatement = parseOne(
+            "SELECT SUM(salary) OVER (ORDER BY amount RANGE 3 PRECEDING) FROM users"
+        ) as SelectStatement
+        val rangeWindow = (rangeStatement.projection as ExpressionProjection).items.single().expression as WindowExpression
+        assertEquals(FrameUnit.Range, rangeWindow.frame!!.unit)
+        assertEquals(FrameBoundType.CurrentRow, rangeWindow.frame!!.end.type)
+
+        val rowsStatement = parseOne(
+            "SELECT SUM(salary) OVER (ORDER BY amount ROWS 3 PRECEDING) FROM users"
+        ) as SelectStatement
+        val rowsWindow = (rowsStatement.projection as ExpressionProjection).items.single().expression as WindowExpression
+        assertEquals(FrameUnit.Rows, rowsWindow.frame!!.unit)
+    }
+
+    @Test
+    fun parsesExplicitGroupsBetweenFrameWithLiteralOffsets() {
+        val statement = parseOne(
+            "SELECT SUM(salary) OVER (ORDER BY amount GROUPS BETWEEN 1 PRECEDING AND 2 FOLLOWING) FROM users"
+        ) as SelectStatement
+        val window = (statement.projection as ExpressionProjection).items.single().expression as WindowExpression
+        val frame = window.frame!!
+        assertEquals(FrameUnit.Groups, frame.unit)
+        assertEquals(FrameBoundType.Preceding, frame.start.type)
+        assertEquals(LiteralExpression(Value.IntegerValue(1)), frame.start.offset)
+        assertEquals(FrameBoundType.Following, frame.end.type)
+        assertEquals(LiteralExpression(Value.IntegerValue(2)), frame.end.offset)
+    }
+
+    @Test
+    fun groupsShorthandWithoutBetweenEndsAtCurrentRow() {
+        val statement = parseOne(
+            "SELECT SUM(salary) OVER (ORDER BY amount GROUPS 3 PRECEDING) FROM users"
+        ) as SelectStatement
+        val window = (statement.projection as ExpressionProjection).items.single().expression as WindowExpression
+        assertEquals(FrameUnit.Groups, window.frame!!.unit)
+        assertEquals(FrameBoundType.CurrentRow, window.frame!!.end.type)
+    }
+
+    @Test
+    fun groupsFrameStartAfterFrameEndFailsToParse() {
+        assertFailsWith<ParseException> {
+            parseOne("SELECT SUM(salary) OVER (ORDER BY amount GROUPS BETWEEN CURRENT ROW AND 1 PRECEDING) FROM users")
+        }
+    }
+
+    @Test
+    fun parsesRangeBetweenUnboundedAndCurrentRow() {
+        val statement = parseOne(
+            "SELECT SUM(salary) OVER (ORDER BY amount RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) FROM users"
+        ) as SelectStatement
+        val window = (statement.projection as ExpressionProjection).items.single().expression as WindowExpression
+        val frame = window.frame!!
+        assertEquals(FrameUnit.Range, frame.unit)
+        assertEquals(FrameBoundType.UnboundedPreceding, frame.start.type)
+        assertEquals(FrameBoundType.CurrentRow, frame.end.type)
+    }
+
+    @Test
+    fun rangeFrameStartAfterFrameEndFailsToParse() {
+        assertFailsWith<ParseException> {
+            parseOne("SELECT SUM(salary) OVER (ORDER BY amount RANGE BETWEEN CURRENT ROW AND 1 PRECEDING) FROM users")
+        }
+    }
+
+    @Test
+    fun frameWithNoExcludeClauseDefaultsToNoOthers() {
 }