Question

我知道这不是一个应该在这里提出的问题。请帮我解决这个问题。

我尝试在下面的查询中使用case语句，但是我找不到我在其中所做的错误。请帮助我..

SELECT
tsc_accessory_details_for_repaired_and_qc_pass_phone_list.Ccord
(CASE WHEN tsc_accessory_details_for_repaired_and_qc_pass_phone_list.Ccord == 'NVA' THEN 'NON_ValueAccessory'), 
COUNT(tsc_accessory_details_for_repaired_and_qc_pass_phone_list.Ccord) Ccord_count
FROM
tsc_accessory_details_for_repaired_and_qc_pass_phone_list
WHERE
tsc_accessory_details_for_repaired_and_qc_pass_phone_list.Ccord = 'NVA'
GROUP BY
tsc_accessory_details_for_repaired_and_qc_pass_phone_list.Ccord

我收到如下错误

SQL] SELECT       tsc_accessory_details_for_repaired_and_qc_pass_phone_list.Ccord       （例如tsc_accessory_details_for_repaired_and_qc_pass_phone_list.Ccord ==＆＃39; NVA＆＃39;那么＆＃39; ok＆＃39;），       COUNT（tsc_accessory_details_for_repaired_and_qc_pass_phone_list.Ccord）Ccord_count       从       tsc_accessory_details_for_repaired_and_qc_pass_phone_list       哪里       tsc_accessory_details_for_repaired_and_qc_pass_phone_list.Ccord =＆＃39; NVA＆＃39;       通过...分组       tsc_accessory_details_for_repaired_and_qc_pass_phone_list.Ccord

[Err] 1064 - 您的SQL语法有错误;查看与您的MySQL服务器版本对应的手册，以便在＆＃39; ==＆＃39; NVA＆＃39;附近使用正确的语法。然后好的＆＃39;），       COUNT（第3行的tsc_accessory_details_for_repaired_and_qc_pass_phon＆＃39;

Answer 1

你的桌名太长了。如果缩短名称，您必须使用较短的名称或仅使用同义词。试试这个查询 -

SELECT ta.Ccord
      , (CASE WHEN ta.Ccord = 'NVA' THEN 'NON_ValueAccessory' END)
      , COUNT(ta.Ccord) Ccord_count
FROM tsc_accessory_details_for_repaired_and_qc_pass_phone_list ta
WHERE ta.Ccord = 'NVA'
GROUP BY ta.Ccord, ta.Ccord

Answer 2

我可以在这里看到一些错误。

没有end case
使用分组依据选择只能按字段分组并汇总结果

mysql case语句无法正常工作

2 个答案: