Question

我对SQL很新。我只是想生成一个表并在某些条件下填写一些值。你在这个查询中看到任何语法错误吗？非常肯定错误在case语句中，因为没有case语句，表生成就好了。

q = "select tbuc.csId, tbui.role_type, 
(case when tbui.role_type = "ROLE_USER" then 1 else 0 end) as
assignment_submitted FROM tb_user_click tbuc, tb_user_info tbui WHERE 
tbui.user_id = tbuc.uId and tbuc.csId = tbui.class_section_id;"

也尝试使用IIF，错误信息如下：

File "1.py", line 118
q = "select tbuc.csId, tbui.role_type,IIF(role_type = "ROLE_USER", 1, 0) 
as assignment_submitted FROM tb_user_click tbuc, tb_user_info tbui 
WHERE tbui.user_id = tbuc.uId and tbuc.csId = tbui.class_section_id;"
SyntaxError: invalid syntax

Answer 1

使用单引号，例如

q = "select tbuc.csId, tbuc.uId, tbuc.cId, tbui.role_type, tbuc.time as login_date"
    + ", tbuc.sessId, (case when tbui.role_type = 'ROLE_USER' then 1 else 0 end) "
    + "as assignment_submitted FROM tb_user_click tbuc, tb_user_info tbui WHERE "
    + "tbui.user_id = tbuc.uId and tbuc.csId = tbui.class_section_id;"

或者转义双引号，例如

q = "select tbuc.csId, tbuc.uId, tbuc.cId, tbui.role_type, tbuc.time as login_date"
    + ", tbuc.sessId, (case when tbui.role_type = \"ROLE_USER\" then 1 else 0 end"
    + ") as assignment_submitted FROM tb_user_click tbuc, tb_user_info tbui WHERE "
    + "tbui.user_id = tbuc.uId and tbuc.csId = tbui.class_section_id;"

或者（假设您的客户端支持它）使用绑定参数，如

q = "select tbuc.csId, tbuc.uId, tbuc.cId, tbui.role_type, tbuc.time as login_date"
    + ", tbuc.sessId, (case when tbui.role_type = ? then 1 else 0 end) "
    + "as assignment_submitted FROM tb_user_click tbuc, tb_user_info tbui WHERE "
    + "tbui.user_id = tbuc.uId and tbuc.csId = tbui.class_section_id;"

查询语法错误

1 个答案: