If "until" is "!=", the sense of the test is negated. That is, as
long as the query on "table" specified by "where" and "columns"
returns "rows", the transaction will be rolled back and restarted
If "until" is "!=", the sense of the test is negated. That is, as
long as the query on "table" specified by "where" and "columns"
returns "rows", the transaction will be rolled back and restarted