What causes SqlInvalidDbQueryString?

The SQL query contains a syntax error (missing keyword, unbalanced parentheses, wrong join syntax). A table or column referenced in the query does not exist in the database. A dynamic expression in the query string resolved to an invalid SQL fragment at runtime

How do I fix SqlInvalidDbQueryString?

Copy the query string from the ADF activity configuration and run it directly in SSMS or the Azure Query Editor to identify the syntax error.. Check that all table and column names referenced in the query exist in the database.. If using dynamic expressions in the query, log the resolved value using a Set Variable activity and inspect it.. Use parameterized queries instead of string concatenation to avoid runtime SQL injection or syntax issues.

Medium severitydata source

Power BI Refresh Error:
SqlInvalidDbQueryString

What does this error mean?

The SQL query in the ADF copy activity source is syntactically invalid or references objects that do not exist in the target database.

Common causes

1The SQL query contains a syntax error (missing keyword, unbalanced parentheses, wrong join syntax)
2A table or column referenced in the query does not exist in the database
3A dynamic expression in the query string resolved to an invalid SQL fragment at runtime

How to fix it

1Copy the query string from the ADF activity configuration and run it directly in SSMS or the Azure Query Editor to identify the syntax error.
2Check that all table and column names referenced in the query exist in the database.
3If using dynamic expressions in the query, log the resolved value using a Set Variable activity and inspect it.
4Use parameterized queries instead of string concatenation to avoid runtime SQL injection or syntax issues.

Frequently asked questions

Does this error affect all pipeline runs or just the current one?

Depends on the root cause. A persistent misconfiguration fails every run; a transient issue may resolve on retry. Check the run history.

Can this error appear in Azure Data Factory and Microsoft Fabric pipelines?

Yes — the same connector errors appear in both ADF and Fabric Data Factory pipelines.

How do I see the full error detail for an ADF pipeline failure?

In ADF Monitor, click the failed run, then the failed activity. The detail pane shows the error code, message, and sub-error codes.

Will downstream Power BI datasets be affected when an ADF pipeline fails?

Yes — a dataset refreshing after the pipeline will use stale data or fail if the target table was cleared. The Power BI refresh may succeed while serving wrong data.

Official documentation: https://learn.microsoft.com/en-us/azure/data-factory/connector-troubleshoot-synapse-sql