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# LogiView

## Combination of Multiple Where Clauses

| You may combine several Where clauses using logical operators. Each Where clause may comprise several linked Where clauses with optional parentheses.
| Combining Where Clauses
| ### Syntax:
| {WHERE} & {WHERE} OR {WHERE} | {WHERE}
{WHERE} | First Where clause
& | Logic operator for AND relation.
| | Logic operator for OR relation
{WHERE} | Second Where clause
| ### Example:
| Definition of a selection condition as argument of a 'where' command (part of the combined select instruction):
    where("MAT.MAX_WIDTH">500 & "MAT.ISO"<>100)
| Result:
| All records of the 'MAT' table are selected that contain a value greater than 500 in the 'MAX_WIDTH' field and whose 'ISO' field contents is not equal to 100.
| ### Selection of data records
| Please note that the use of Where clauses with logical operators will display different search results depending on the LogiView command being used. #### "Select" command Using the "select" command, records will be read directly from the database, thus displaying the records that exactly match the search criteria defined with the logical operators ("AND" or "OR") in the Where clause. #### "Select_ent" command Using the "select_ent" command will search for records via a mask (e.g. item mask) and the search criteria in the LogiView command is inserted into the mask fields. Since the contents of the mask fields are coercively connected with the logic operator "AND", any Where clause with the logical operator"OR" is ignored. Therefore, the search result contains different records compared to using the "select" command.