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(3). ¸üвÙ×÷

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update t2 set info='bbbbbbbbbbbbbbbbbbbbbbb' where id = 1;

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(4). ɾ³ý²Ù×÷

ÔÚcoord1ÖУ¬Ö´ÐÐɾ³ý²Ù×÷£º

delete from t2 where id = 1;

pgxl_test=# delete from t2 where id = 1; DELETE 1

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