(psycopg2.errors.UndefinedColumn) 列“名称”不存在

Question

我在“NAME”上使用了双引号以使其区分大小写，但它仍然不起作用。 我收到一条错误消息，指出“名称”列不存在。

（我使用 jupyter notebook 和 sql 魔术命令）

ppg = [[],[]]
for x in overall_ppg_leaders:
    reg_ppg = %sql SELECT * FROM "rg_player_stats" WHERE "NAME" = :x;
    po_ppg = %sql SELECT * FROM "po_player_stats" WHERE "NAME" = :x;
    ppg[0].append(reg_ppg)
    ppg[1].append(po_ppg)
print(ppg)

我收到错误：

* postgresql+psycopg2://postgres:***@localhost/NBA_2021-22
(psycopg2.errors.UndefinedColumn) column "name" does not exist
LINE 1: SELECT * FROM rg_player_stats WHERE NAME = 'Kevin Durant';
                                            ^

[SQL: SELECT * FROM rg_player_stats WHERE NAME = %(x)s;]
[parameters: {'x': 'Kevin Durant'}]
(Background on this error at: https://sqlalche.me/e/14/f405)
 * postgresql+psycopg2://postgres:***@localhost/NBA_2021-22
(psycopg2.errors.UndefinedColumn) column "name" does not exist
LINE 1: SELECT * FROM po_player_stats WHERE NAME = 'Kevin Durant';
                                            ^

[SQL: SELECT * FROM po_player_stats WHERE NAME = %(x)s;]
[parameters: {'x': 'Kevin Durant'}]
(Background on this error at: https://sqlalche.me/e/14/f405)
 * postgresql+psycopg2://postgres:***@localhost/NBA_2021-22
(psycopg2.errors.UndefinedColumn) column "name" does not exist
LINE 1: SELECT * FROM rg_player_stats WHERE NAME = 'Donovan Mitchell...
                                            ^

我还注意到，当我使用 cell magic %%sql时，带双引号的列名有效，但当我使用单行 magic %sql时出现错误

此代码工作正常

这段代码给我一个错误

Answer 1

使用单行魔术命令%sql时，请使用"\"NAME\""而不是 "NAME"，以便它区分大小写。

ppg = [[],[]]
for x in overall_ppg_leaders:
    reg_ppg = %sql SELECT "\"PPG\"" FROM "rg_player_stats" WHERE "\"NAME\"" = :x;
    po_ppg = %sql SELECT "\"PPG\"" FROM "po_player_stats" WHERE "\"NAME\"" = :x;
    ppg[0].append(reg_ppg)
    ppg[1].append(po_ppg)
print(ppg)

此代码有效