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Returned whether the given column is a signed number for the specified result set meta data. #### Syntax isSigned( resultsetmetadata , index ) resultsetmetadata.isSigned( index ) #### Parameters
resultsetmetadata | the result set meta data object to check.
index | the index of the column.
#### Returns
boolean | true if the column is a signed number. false if the column is not a signed number.
#### Example
    if rsmd.isSigned( 1 ) then
        break
    end
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