SELECT
st.*,
sc.s_score AS '语文',
sc2.s_score AS '数学'
FROM
student st
LEFT JOIN score sc ON sc.s_id=st.s_id AND sc.c_id='01'
LEFT
SELECT
st.*,
sc.s_score AS '语文',
sc2.s_score AS '数学'
FROM
student st
LEFT JOIN score sc ON sc.s_id=st.s_id AND sc.c_id='01'
LEFT