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A.SELECT * FROM sc WHERE grade=NULL
B.SELECT * FROM sc WHERE grade IS “  ”
C.SELECT * FROM sc WHERE grade=‘  ’
D.SELECT * FROM sc WHERE grade IS NULL

A.SELECT * FROM 學(xué)習(xí)經(jīng)歷 WHERE 畢業(yè)學(xué)校 LIKE ´*清華*´
B.SELECT * FROM 學(xué)習(xí)經(jīng)歷 WHERE 畢業(yè)學(xué)校 = ´%清華%´
C.SELECT * FROM 學(xué)習(xí)經(jīng)歷 WHERE 畢業(yè)學(xué)校 LIKE ´%清華%´
D.SELECT * FROM 學(xué)習(xí)經(jīng)歷 WHERE 畢業(yè)學(xué)校 LIKE ´？清華？´