Analisi errata della variabile MS SQL dinamica

1. Utilizza i tipi corretti SYSNAME per gli identificatori, NVARCHAR(MAX) per interrogazione
2. Usa REPLACE invece di concatenare sarà molto più facile eseguire il debug soprattutto quando hai bisogno di stringhe letterali
3. Considera l'utilizzo di QUOTENAME funzione

Codice:

DECLARE 
    @tableName  SYSNAME,
    @columnName SYSNAME,
    @prompt     VARCHAR(20),
    @dynSQL     NVARCHAR(MAX);

SET @tableName  = QUOTENAME('A1-ExciseESN');
SET @columnName = QUOTENAME('Anode Excise ESN (A1)');

SET @dynSQL = 
N'INSERT INTO  <tableName> 
 ([trav num], <columnName>)
Select [trav num], <columnName>
FROM [temprmi$] t1
PIVOT(min([Lvl1 Trace Data])
FOR [Prompt Text] IN (<columnName>)
   ) AS PVTTable
     where <columnName> is not null 
        and [trav num] not in (select [trav num] from <tableName> )'

SET @dynSQL = REPLACE(REPLACE(@dynSQL, '<tableName>', @tableName),
               '<columnName>', @columnName);

PRINT @dynSQL;

LiveDemo

Uscita:

INSERT INTO  [A1-ExciseESN] 
 ([trav num], [Anode Excise ESN (A1)])
Select [trav num], [Anode Excise ESN (A1)]
FROM [temprmi$] t1
PIVOT(min([Lvl1 Trace Data])
FOR [Prompt Text] IN ([Anode Excise ESN (A1)])
   ) AS PVTTable
     where [Anode Excise ESN (A1)] is not null 
       and [trav num] not in (select [trav num] from [A1-ExciseESN] )