sql更新字段路径

如果用sql语句更改lj字段的路径，如下：
lj
7/200781616183095962.jar
8/f_200812111413292.jar
8/f_200812111413291.jar

得到的结果如下：
lj
1/7/200781616183095962.jar
1/8/f_200812111413292.jar
1/8/f_200812111413291.jar

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SQL code:
UPDATE TB SET LJ='1'+LJ

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SQL code:
update tb set lj='1/'+lj

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SQL code:
update table set lj = '1/'+lj
?

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SQL code:

UPDATE TB SET LJ='1/'+LJ

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SQL code:

update tb set lj='1/'+lj

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.

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SQL code:
update tb set 1j='1/'+ 1j ;

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SQL code:

update table set lj = '1/'+lj

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update tb set