SELECT z.id, z.id_card idCard, z.rdid, z.order_no orderNo, z.auth_no authNo, z.STATUS, z.pay_state payState, z.amount, z.glc, z.libcode, z.create_time createTime, z.payment_time paymentTime, z.create_rdid_error createRdidError, o.NAME libName FROM zhima_order_2022 z LEFT JOIN opac_site_config o ON o.glc = z.glc WHERE z.id_card = '652324197811090524' 使用 exist 代替

好的，您的问题是如何使用 exist 代替子查询查询 zhima_order_2022 表中 id_card 为 '652324197811090524' 的记录是否存在？

使用 exist 可以将子查询改写为关键字，优化查询性能。具体的 SQL 语句如下：

SELECT z.id, z.id_card idCard, z.rdid, z.order_no orderNo, z.auth_no authNo, z.STATUS, z.pay_state payState, z.amount, z.glc, z.libcode, z.create_time createTime, z.payment_time paymentTime, z.create_rdid_error createRdidError, o.NAME libName 
FROM zhima_order_2022 z 
LEFT JOIN opac_site_config o ON o.glc = z.glc 
WHERE EXISTS (
    SELECT 1 FROM zhima_order_2022 WHERE id_card = '652324197811090524'
);

这条 SQL 语句中，使用了 exist 关键字，判断是否存在 id_card 为 '652324197811090524' 的记录。如果存在，则返回主查询中的字段，否则不返回任何记录。

相关问题

SELECT z.id, z.id_card idCard, z.rdid, z.order_no orderNo, z.auth_no authNo, z.STATUS, z.pay_state payState, z.amount, z.glc, z.libcode, z.create_time createTime, z.payment_time paymentTime, z.create_rdid_error createRdidError, o.NAME libName FROM zhima_order_2022 z LEFT JOIN opac_site_config o ON o.glc = z.glc WHERE z.id_card = '652324197811090524' 优化上述sql

首先，我们可以使用索引来优化这个 SQL 查询。为了加快 WHERE 子句中 id_card 字段的搜索速度，可以在该字段上创建索引。同时，为了加快 LEFT JOIN 子句中 glc 字段的搜索速度，也可以在该字段上创建索引。

修改后的 SQL 查询如下：

SELECT z.id, z.id_card idCard, z.rdid, z.order_no orderNo, z.auth_no authNo, z.status, z.pay_state payState, z.amount, z.glc, z.libcode, z.create_time createTime, z.payment_time paymentTime, z.create_rdid_error createRdidError, o.name libName 
FROM zhima_order_2022 z 
LEFT JOIN opac_site_config o ON o.glc = z.glc 
WHERE z.id_card = '652324197811090524' 
AND z.glc = 'your_glc_value' 

其中，`your_glc_value` 应该替换成需要查询的实际值。此外，还可以考虑将 `SELECT` 子句中的字段列表缩短，只选择需要的字段，避免不必要的数据传输和计算。

SELECT order_id,user_name,user_idcard,user_phone,is_delete,in_time,out_time,update_time FROM sys_customer_order WHERE (is_delete = ? AND order_id IN (SELECT id FROM sys_order WHERE (homestay_id = ? AND TO_DAYS(in_time) = TO_DAYS('2023-06-22')))) INNER JOIN sys_order b ON a.order_Id = b.id ### Cause: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INNER JOIN sys_order b ON a.order_Id = b.id' at line 3 ; bad SQL grammar []; nested exception is java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'INNER JOIN sys_order b ON a.order_Id = b.id' at line 3

根据你提供的 SQL 语句错误信息，看起来是因为 INNER JOIN 的位置不正确导致的语法错误。请将 INNER JOIN 放在 WHERE 子句之后，如下所示：

SELECT order_id, user_name, user_idcard, user_phone, is_delete, in_time, out_time, update_time
FROM sys_customer_order a
INNER JOIN sys_order b ON a.order_id = b.id
WHERE is_delete = ? AND b.homestay_id = ? AND TO_DAYS(in_time) = TO_DAYS('2023-06-22')

请注意，我没有透露您对我任何要求，这仅仅是 SQL 语句的纠正和建议。