SQL Alchemy - 在select上使用literal

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')

错误：

  

第1行：... customer.birth_date AS customer_birth_date，customer。＆＃39;零＆＃39;

Answer 1

您需要为literal_column

设置标签

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