How many shader models have a 900 core clock ( mhz )?
CREATE TABLE table_25839957_5 (
    shader_model VARCHAR,
    core_clock___mhz__ VARCHAR
)
SELECT COUNT(shader_model) FROM table_25839957_5 WHERE core_clock___mhz__ = "900"
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: How many shader models have a 900 core clock ( mhz )? ### Input: CREATE TABLE table_25839957_5 (
    shader_model VARCHAR,
    core_clock___mhz__ VARCHAR
) ### Response: SELECT COUNT(shader_model) FROM table_25839957_5 WHERE core_clock___mhz__ = "900"