Add operator documentation (BETWEEN, LIKE, IN, IS DISTINCT FROM)

docs/sphinx/source/reference/sql_commands/DQL/Operators.rst

@@ -8,6 +8,10 @@ Operators
     Operators/Logical
     Operators/Comparison
     Operators/IS
+    Operators/IS_DISTINCT_FROM
+    Operators/BETWEEN
+    Operators/LIKE
+    Operators/IN
 
 .. list-table::
 
@@ -19,3 +23,11 @@ Operators
       - `<`, `>`, `<=`, `>=`, `=`, `!=`
     * - :ref:`IS Operator <is-operators>`
       - `IS`, `IS NOT`
+    * - :ref:`IS DISTINCT FROM Operator <is-distinct-from>`
+      - `IS DISTINCT FROM`, `IS NOT DISTINCT FROM`
+    * - :ref:`BETWEEN Operator <between>`
+      - `BETWEEN`, `NOT BETWEEN`
+    * - :ref:`LIKE Operator <like>`
+      - `LIKE`, `NOT LIKE`
+    * - :ref:`IN Operator <in>`
+      - `IN`, `NOT IN`

docs/sphinx/source/reference/sql_commands/DQL/Operators/BETWEEN.diagram

@@ -0,0 +1,8 @@
+Diagram(
+    NonTerminal('expression'),
+    Optional(Terminal('NOT'), 1),
+    Terminal('BETWEEN'),
+    NonTerminal('lower_bound'),
+    Terminal('AND'),
+    NonTerminal('upper_bound')
+)

docs/sphinx/source/reference/sql_commands/DQL/Operators/BETWEEN.rst

@@ -0,0 +1,225 @@
+=======
+BETWEEN
+=======
+
+.. _between:
+
+Tests whether a value falls within a specified range (inclusive).
+
+Syntax
+======
+
+.. raw:: html
+    :file: BETWEEN.diagram.svg
+
+The BETWEEN operator is used in WHERE clauses:
+
+.. code-block:: sql
+
+    SELECT column1, column2
+    FROM table_name
+    WHERE column1 BETWEEN lower_value AND upper_value
+
+Parameters
+==========
+
+``expression``
+    The value to test. Can be a column name, calculation, or any valid expression.
+
+``lower_bound``
+    The lower bound of the range (inclusive).
+
+``upper_bound``
+    The upper bound of the range (inclusive).
+
+``NOT`` (optional)
+    Negates the result - returns true if the value is **outside** the range.
+
+Returns
+=======
+
+Returns:
+- ``TRUE`` if ``expression >= lower_bound AND expression <= upper_bound``
+- ``FALSE`` otherwise
+- ``NULL`` if any operand is NULL
+
+With ``NOT BETWEEN``:
+- ``TRUE`` if ``expression < lower_bound OR expression > upper_bound``
+- ``FALSE`` otherwise
+- ``NULL`` if any operand is NULL
+
+**Important**: If ``lower_bound > upper_bound``, the range is empty and ``BETWEEN`` always returns ``FALSE``.
+
+Examples
+========
+
+Setup
+-----
+
+For these examples, assume we have a ``products`` table:
+
+.. code-block:: sql
+
+    CREATE TABLE products(
+        id BIGINT,
+        name STRING,
+        price BIGINT,
+        stock INTEGER,
+        PRIMARY KEY(id))
+
+    INSERT INTO products VALUES
+        (1, 'Widget A', 100, 50),
+        (2, 'Widget B', 150, 30),
+        (3, 'Gadget X', 200, 20),
+        (4, 'Tool A', 80, 100),
+        (5, 'Tool B', 120, 15)
+
+BETWEEN with Numbers
+--------------------
+
+Find products with prices between 100 and 150 (inclusive):
+
+.. code-block:: sql
+
+    SELECT name, price
+    FROM products
+    WHERE price BETWEEN 100 AND 150
+
+.. list-table::
+    :header-rows: 1
+
+    * - :sql:`name`
+      - :sql:`price`
+    * - :json:`"Widget A"`
+      - :json:`100`
+    * - :json:`"Widget B"`
+      - :json:`150`
+    * - :json:`"Tool B"`
+      - :json:`120`
+
+NOT BETWEEN
+-----------
+
+Find products with prices outside the range 100-150:
+
+.. code-block:: sql
+
+    SELECT name, price
+    FROM products
+    WHERE price NOT BETWEEN 100 AND 150
+
+.. list-table::
+    :header-rows: 1
+
+    * - :sql:`name`
+      - :sql:`price`
+    * - :json:`"Tool A"`
+      - :json:`80`
+    * - :json:`"Gadget X"`
+      - :json:`200`
+
+BETWEEN with Equal Bounds
+--------------------------
+
+Test for exact value using BETWEEN:
+
+.. code-block:: sql
+
+    SELECT name, price
+    FROM products
+    WHERE price BETWEEN 100 AND 100
+
+.. list-table::
+    :header-rows: 1
+
+    * - :sql:`name`
+      - :sql:`price`
+    * - :json:`"Widget A"`
+      - :json:`100`
+
+This is equivalent to ``WHERE price = 100``.
+
+Empty Range
+-----------
+
+If lower bound > upper bound, no rows match:
+
+.. code-block:: sql
+
+    SELECT name, price
+    FROM products
+    WHERE price BETWEEN 150 AND 100
+
+Returns empty result set (no rows).
+
+Combined with OR
+----------------
+
+Use multiple BETWEEN clauses with OR:
+
+.. code-block:: sql
+
+    SELECT name, price
+    FROM products
+    WHERE price BETWEEN 80 AND 100 OR price BETWEEN 180 AND 220
+
+.. list-table::
+    :header-rows: 1
+
+    * - :sql:`name`
+      - :sql:`price`
+    * - :json:`"Tool A"`
+      - :json:`80`
+    * - :json:`"Widget A"`
+      - :json:`100`
+    * - :json:`"Gadget X"`
+      - :json:`200`
+
+Important Notes
+===============
+
+Inclusive Range
+---------------
+
+``BETWEEN`` uses **inclusive** bounds. Both ``lower_bound`` and ``upper_bound`` are included in the matching range.
+
+NULL Handling
+-------------
+
+If any operand (expression, lower_bound, or upper_bound) is NULL, the result is NULL:
+
+.. code-block:: sql
+
+    -- Returns NULL
+    WHERE NULL BETWEEN 1 AND 10
+
+    -- Returns NULL
+    WHERE price BETWEEN NULL AND 100
+
+    -- Returns NULL
+    WHERE price BETWEEN 100 AND NULL
+
+Equivalence
+-----------
+
+``BETWEEN`` is shorthand for a range check:
+
+.. code-block:: sql
+
+    -- These are equivalent:
+    WHERE x BETWEEN a AND b
+    WHERE x >= a AND x <= b
+
+    -- These are equivalent:
+    WHERE x NOT BETWEEN a AND b
+    WHERE x < a OR x > b
+
+Type Compatibility
+------------------
+
+The expression, lower_bound, and upper_bound must be of compatible types. The comparison follows SQL type coercion rules.
+
+See Also
+========
+
+* :ref:`Comparison Operators <comparison-operators>` - Other comparison operations

docs/sphinx/source/reference/sql_commands/DQL/Operators/Comparison.rst

@@ -2,11 +2,35 @@
 Comparison Operators
 ====================
 
-
 .. _comparison-operators:
 
-TODO: flesh out doc
+Standard Comparison Operators
+==============================
+
+We support standard comparison operators: ``>``, ``>=``, ``=``, ``<``, ``<=``, ``!=``, ``<>``
+
+If either the left or right operand is NULL, the comparison result is NULL.
+
+.. code-block:: sql
+
+    SELECT * FROM products WHERE price > 100
+    SELECT * FROM products WHERE price <= 50
+    SELECT * FROM products WHERE name = 'Widget'
+    SELECT * FROM products WHERE stock != 0
+
+IS DISTINCT FROM
+================
+
+NULL-safe comparison operator that treats NULL values as comparable:
+
+- ``expression1 IS DISTINCT FROM expression2`` - Returns ``TRUE`` if values are different (treating NULL as a value)
+- ``expression1 IS NOT DISTINCT FROM expression2`` - Returns ``TRUE`` if values are the same (treating NULL as a value)
+
+Unlike ``=`` and ``!=``, this operator never returns NULL.
+
+For detailed documentation, examples, and use cases, see :ref:`IS DISTINCT FROM <is-distinct-from>`.
 
-We support comparison operators: :sql:`>`, :sql:`>=`, :sql:`=`, :sql:`<`, :sql:`<=`, :sql:`!=`
+See Also
+========
 
-If the left or right operand is :sql:`NULL`, the comparison result is :sql:`NULL`.
+* :ref:`IS Operator <is-operators>` - IS NULL, IS TRUE, IS FALSE

docs/sphinx/source/reference/sql_commands/DQL/Operators/IN.diagram

@@ -0,0 +1,11 @@
+Diagram(
+    NonTerminal('expression'),
+    Optional(Terminal('NOT'), 1),
+    Terminal('IN'),
+    Terminal('('),
+    OneOrMore(
+        NonTerminal('value'),
+        Terminal(',')
+    ),
+    Terminal(')')
+)