Access中一个查询问题

请教:access中有想sql server中"substring"这样的函数吗?比如在sql server中查询字段"bh"的前四位:"select substring(bh,1,4) from 表1",不知道access类似的是怎样写?
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select mid(bh,1,4) as bbb from table1

用left right一样可以做到

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