ms access - [] brackets in sql statements -

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what brackets in sql statement?

for example, in statement: 

insert table1 ([columnname1], columnname2) values (val1, val2)

also, if table name in brackets?

the [] marks delimitation of identifier, if have column name contains spaces order qty need enclose [] like:

select [order qty] [client sales]

they escape reserved keywords used identifiers


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