SQL鍊金術 - 在選擇

Question

t1 = aliased(XXXXX, name='T1') 
t2 = aliased(YYYYY, name='T2') 
t3 = aliased(ZZZZZ, name='T3') 

s1 = select([t1.std_cpf, 
      t1.email, 
      t1.gender, 
      t1.id, 
      t1.birth_date, 
      literal_column("'zero'") 
      ]) 

s2 = select([t2.std_cpf, 
      t2.email, 
      t2.gender, 
      t2.id, 
      t2.birth_date, 
      literal_column("'zero'") 
      ]) 

s3 = select([t3.std_cpf, 
      t3.email, 
      t3.gender, 
      t3.id, 
      t3.birth_date, 
      literal_column("'zero'") 
      ]) 

q = sqlalchemy.sql.expression.union(s1, s2, s3).alias('customer') 

錯誤使用文字：

LINE 1: ...customer.birth_date AS customer_birth_date, customer.'zero'

Answer 1

您需要設置標籤的literal_column

s1 = select([t1.std_cpf, 
      t1.email, 
      t1.gender, 
      t1.id, 
      t1.birth_date, 
      literal_column("'zero'").label('zero') 
      ])