title: What does "::" mean in a SQL context?
body: <p>What does the "::" syntax mean in SSDT error message SQL71561? For example: </p>
  
  <blockquote>
    <p>SQL71561: View: [dbo].[V_RPT_MART_SIGNALS] contains an unresolved reference to an object.Either the object does not exist or the reference is ambiguous because it could refer to any of the following objects: <br />
    [SSISDB].[CATALOG].[EXECUTIONS].[EXECUTION_ID] or <br />
    [SSISDB].[CATALOG].[EXECUTIONS].[TM]::[EXECUTION_ID]</p>
  </blockquote>
  
  <p>This seems like such a strange syntax to see in in a SQL context, I can't believe I can't find it documented anywhere. (I've found that doing an online search for "::" doesn't work too well!)</p>