database.Default_Time是不是等同于CreateTime string `json:"createTime" gorm:"size:255;comment:创建时间"` UpdateTime string `json:"updateTime" gorm:"size:255;comment:更新时间"`

根据你提供的代码片段，`database.Default_Time`并不等同于`CreateTime`和`UpdateTime`。

`database.Default_Time`可能是一个在数据库操作中用于表示默认时间的常量或变量。它的具体定义可能在代码的其他位置。

而`CreateTime`和`UpdateTime`是结构体中的两个字段，用于表示创建时间和更新时间。它们的类型都是字符串(`string`)，并且使用了`gorm`标签来指定数据库表字段的属性，如大小(`size`)和注释(`comment`)。

因此，虽然这些字段都与时间相关，但它们表示的含义和用途是不同的。

相关问题

select advert.id as id, advert.advert_no as advertNo, advert.title, advert.advert_type as advertType, advert.advert_position as advertPosition, advert.advert_url as advertUrl, advert.start_time as startTime, advert.end_time as endTime, advert.create_time as createTime, ua.nick_name as createdByName , if(NOW()>advert.start_time,1,if(NOW()<advert.start_time),2,3) AS zhuangtai from ( select ja.id,ja.advert_no, ja.title, ja.advert_type,ja.advert_position,ja.advert_url, ja.start_time, ja.end_time, ja.created_by, ja.create_time from job_advert ja where ja.is_delete = 0 order by ja.create_time desc )advert LEFT JOIN ums_admin ua on advert.created_by = ua.id order by advert.id desc 这段sql有什么语法问题

从语法上看，这段 SQL 语句中有一个语法错误：

if(NOW()>advert.start_time,1,if(NOW()<advert.start_time),2,3) AS zhuangtai

应该修改为：

IF(NOW() > advert.start_time, 1, IF(NOW() < advert.end_time, 2, 3)) AS zhuangtai

修改后的语句中，使用了 MySQL 的 IF 函数，来判断当前时间和广告的开始时间、结束时间的关系，从而返回对应的状态。同时，将 SQL 函数名改为了大写字母，以符合 MySQL 的语法规范。

SELECT hd.id, ar.id AS areaId, hd.PASSWORD, hd.NAME AS username, hd.sex, hd.mobile AS phone, hd.card_number AS cardNumber, hd.address AS address, hd.avatar AS avatarUrl, hd.house_number AS room, hd.sum_integration AS bonus, hd.retrievable_integration AS retrievableIntegration, hd.harmful_integration AS harmfulIntegration, hd.foodwaste_integration AS foodwasteIntegration, hd.use_integration AS useIntegration, hd.other_integration AS otherIntegration, hd.village AS areaName, hd.pid, hd.division_id AS divisionId, hd.login_degree AS loginDegree, hd.province, hd.city, hd.county, hd.street, hd.qr_code AS qrCode, hd.barcode, hd.STATUS, FROM_UNIXTIME( hd.create_time ) AS createTime, FROM_UNIXTIME( hd.update_time ) AS updateTime, hd.oldcard, hd.accounts_code AS accountsCode, hd.type, hd.token, hd.openid, hd.tong_interal AS tongInteral, hd.tong_interal1 AS tongInteral1, hd.vali, CONCAT( '[', hm.number, ']', hm.NAME ) AS homeName, FROM_UNIXTIME( hi.create_time ) AS deliverTime FROM hs_household hd LEFT JOIN hs_management hm ON hd.division_id = hm.id LEFT JOIN hs_area ar ON ar.id = 23 LEFT JOIN hs_integration_log hi ON hi.user_code = hd.id WHERE ( hd.province = ar.NAME OR hd.city = ar.NAME OR hd.county = ar.NAME OR hd.street = ar.NAME ) GROUP BY hd.id LIMIT 1, 10这条sql怎么加索引

这条 SQL 中涉及到的表有 hs_household、hs_management、hs_area、hs_integration_log，您需要根据具体情况来确定需要为哪些字段添加索引。以下是一些可能需要添加索引的字段：

1. hs_household 表的字段：card_number、mobile、division_id
2. hs_management 表的字段：id
3. hs_area 表的字段：id、NAME
4. hs_integration_log 表的字段：user_code、create_time

您可以使用如下命令添加索引：

1. 为 hs_household 表的 card_number、mobile、division_id 字段添加索引：

ALTER TABLE hs_household ADD INDEX idx_card_number (card_number);
ALTER TABLE hs_household ADD INDEX idx_mobile (mobile);
ALTER TABLE hs_household ADD INDEX idx_division_id (division_id);

2. 为 hs_management 表的 id 字段添加索引：

ALTER TABLE hs_management ADD INDEX idx_id (id);

3. 为 hs_area 表的 id、NAME 字段添加索引：

ALTER TABLE hs_area ADD INDEX idx_id (id);
ALTER TABLE hs_area ADD INDEX idx_name (NAME);

4. 为 hs_integration_log 表的 user_code、create_time 字段添加索引：

ALTER TABLE hs_integration_log ADD INDEX idx_user_code (user_code);
ALTER TABLE hs_integration_log ADD INDEX idx_create_time (create_time);

当然，您需要根据具体情况来确定哪些字段需要添加索引，避免添加过多的索引导致查询性能下降。