[Yandex Cloud documentation](../../../index.md) > [Yandex DataLens](../../index.md) > Troubleshooting > Joining concatenation of multiple tables is not supported

# [Yandex DataLens] Joining concatenation of multiple tables is not supported

`ERR.DS_API.DB.CHYT.INVALID_SORTED_JOIN.CONCAT_NOT_SUPPORTED`

This error occurs when attempting to perform a sorted JOIN with a source representing the concatenation of multiple tables, e.g., list or range of tables.

Use a single table in the join, pre-aggregate the data into a junction table, or move the concatenation to an SQL subquery, and select a supported JOIN strategy.