Support more special cases on SQLbuilder.

db.go

internal/sqladapter/exql/column.go

internal/sqladapter/exql/column_test.go

internal/sqladapter/exql/column_value_test.go

internal/sqladapter/exql/columns.go

internal/sqladapter/exql/statement.go

internal/sqladapter/exql/where.go

internal/sqladapter/testing/adapter.go.tpl

lib/sqlbuilder/builder.go

lib/sqlbuilder/builder_test.go

lib/sqlbuilder/convert.go

lib/sqlbuilder/interfaces.go

lib/sqlbuilder/select.go