单引号中怎么变量赋值。

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例如:
tx=5;
sql='select t.*,d.name from t_fraginf t join t_fragrant d on t.tno=d.dno having tno=tx';
请问,单引号中的tx如何等于5

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sql=['select t.*,d.name from t_fraginf t join t_fragrant d on t.tno=d.dno having tno=', nub2str(tx) , ';' ];

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