What was the production code of the episode directed by Rondell Sheridan? 
CREATE TABLE table_29102100_1 (prod_code INTEGER, directed_by VARCHAR)
SELECT MAX(prod_code) FROM table_29102100_1 WHERE directed_by = "Rondell Sheridan"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_29102100_1 (prod_code INTEGER, directed_by VARCHAR) Question: What was the production code of the episode directed by Rondell Sheridan?  [/INST] SELECT MAX(prod_code) FROM table_29102100_1 WHERE directed_by = "Rondell Sheridan" </s>