mysql - select statement in case statement sql -

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How do I execute a SQL statement in the statement statement?

I am trying to execute the following query and get the error: 

 , select the case when 'trans_type' & lt; & Gt; Select 'stock' then lname else (select item_name from trans_i, where the range of id = a.id 0,1) as 'transaction' in the form of 'transaction' as the end   
 Database MySQL  
 Error:  
  Error code: 1064 You have an error in your SQL syntax; Please check your manual manual related to the SQL Server version for correct syntax to use the select item_name from the transa limit 0,1   
 ps: I only for the demo purpose table I am using the transaction as the name, this is not a 'transaction' in my real database.   
 
 
 I think this should be the correct statement. Choose  
 , (when trans_type  'stock' then select item_name from a.lname else (trans_i ti where ti.id = a.id boundaries 0, 1) As 'A'     from the 'Lname' transaction as the end)

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