solution used **heukirne** for the names of columns.

fix error occurs when you use multiple databases.

fix error when if fields whose names are reserved word

This alternative solution LIMIT, OFFSET problem SQL Server version older than 2012.

issue #2852

Improved `QueryBuilder::buildLimit()` to support big numbers

Reverted 0bf2dadd: it's very common to use lower case for column types and upper case for other DB keywords.

MSSQL seems to support limits for decimal type, so we add a default
limit.