What is the production code directed by Matt Shakman?
CREATE TABLE table_2945 (
    "No. in Series" real,
    "No. in Season" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Production code" real,
    "U.S. viewers (millions)" text
)
SELECT "Production code" FROM table_2945 WHERE "Directed by" = 'Matt Shakman'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the production code directed by Matt Shakman? ### Input: CREATE TABLE table_2945 (
    "No. in Series" real,
    "No. in Season" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Production code" real,
    "U.S. viewers (millions)" text
) ### Response: SELECT "Production code" FROM table_2945 WHERE "Directed by" = 'Matt Shakman'