--------------
ALTER TABLE engraving_types
  ADD COLUMN single_price          DECIMAL(10,2) NOT NULL DEFAULT 0.00 AFTER price,
  ADD COLUMN extra_engraving_price DECIMAL(10,2) NULL              AFTER single_price
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ERROR 1060 (42S21) at line 33: Duplicate column name 'single_price'
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ALTER TABLE cart_items
  ADD COLUMN engraving_type                   VARCHAR(20)       NULL AFTER engraving_position_value_id,
  ADD COLUMN engraving_position_value_id_2    INT UNSIGNED      NULL AFTER engraving_font_id,
  ADD COLUMN engraving_text_2                 VARCHAR(200)      NULL AFTER engraving_position_value_id_2,
  ADD COLUMN engraving_font_id_2              INT UNSIGNED      NULL AFTER engraving_text_2
--------------

ERROR 1060 (42S21) at line 78: Duplicate column name 'engraving_position_value_id_2'
--------------
ALTER TABLE order_items
  ADD COLUMN engraving_type                   VARCHAR(20)       NULL AFTER engraving_position_value_id,
  ADD COLUMN engraving_position_value_id_2    INT UNSIGNED      NULL AFTER engraving_font_id,
  ADD COLUMN engraving_text_2                 VARCHAR(200)      NULL AFTER engraving_position_value_id_2,
  ADD COLUMN engraving_font_id_2              INT UNSIGNED      NULL AFTER engraving_text_2
--------------

ERROR 1060 (42S21) at line 86: Duplicate column name 'engraving_position_value_id_2'