How should I fix this code with RuntimeError: Catalog Error: Schema with name a does not exist!? (SQL)

Question

我有 2 个表，如下所示：

我想查找按城市排序的员工全名以及毕业和薪水。这是我的代码：

import duckdb
con = duckdb.connect(database=':memory:')

con.execute("""
select
    a.CONCAT(FirstName , ' ' ,LastName) as FullName,
    b.GradID,
    b.Salary
from
    T_Emp a
full join
  T_Grad b
on
  a.GradID = b.GradID
order by City;
""").df()

我得到的错误：

ERROR:root:An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line string', (1, 0))

---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
<ipython-input-30-85b9d80141b2> in <module>()
     11   a.GradID = b.GradID
     12 order by City;
---> 13 """).df()

RuntimeError: Catalog Error: Schema with name a does not exist!
LINE 3:     a.CONCAT(FirstName , ' ' ,LastN...

Answer 1

您对连接字符串的查询有误，请按以下方法解决：

CONCAT(a.FirstName , ' ' ,a.LastName) as FullName

How should I fix this code with RuntimeError: Catalog Error: Schema with name a does not exist!? (SQL)

How should I fix this code with RuntimeError: Catalog Error: Schema with name a does not exist!? (SQL)

sql

duckdb