from tb_net_approvalrecords a left join tb_net_systemupdateversion b on a.versionid = b.versionid

这是一个 SQL 语句，用于将 tb_net_approvalrecords 表与 tb_net_systemupdateversion 表进行左连接。连接条件是这两个表中的 versionid 列相等。左连接表示以 tb_net_approvalrecords 表为主表，将 tb_net_systemupdateversion 表中符合条件的记录也一并返回，如果 tb_net_systemupdateversion 表中没有匹配的记录，则对应位置返回 NULL 值。

相关问题

SELECT a.comm_id, c.Title AS house_keeper_name, ( SELECT build.id FROM erp_base.tb_base_masterdata_resource AS resource INNER JOIN erp_base.tb_base_masterdata_resource AS unit ON unit.id = resource.parent_id INNER JOIN erp_base.tb_base_masterdata_resource AS build ON build.id = unit.parent_id WHERE resource.id = a.resource_id ) AS resource_group, b.resource_type FROM tb_charge_receipts_detail a LEFT JOIN erp_base.tb_base_masterdata_resource b ON a.resource_id = b.id LEFT JOIN erp_base.rf_dictionary c ON b.house_keeper = c.id GROUP BY a.comm_id, c.Title, resource_group, b.resource_type 在mysql中报SELECT list is not in GROUP BY clause and contains nonaggregated column 'erp_charge.a.resource_id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by 如何做sql的修改

根据错误提示，可以尝试修改sql_mode，去掉only_full_group_by，或者添加a.resource_id到GROUP BY子句中，但是这样可能会导致查询结果不准确。为了避免这种情况，可以使用聚合函数来替代a.resource_id，比如使用MAX(a.resource_id)。

修改后的SQL语句如下：

SELECT a.comm_id, c.Title AS house_keeper_name,
(SELECT build.id FROM erp_base.tb_base_masterdata_resource AS resource
INNER JOIN erp_base.tb_base_masterdata_resource AS unit ON unit.id = resource.parent_id
INNER JOIN erp_base.tb_base_masterdata_resource AS build ON build.id = unit.parent_id
WHERE resource.id = a.resource_id) AS resource_group,
b.resource_type
FROM tb_charge_receipts_detail a
LEFT JOIN erp_base.tb_base_masterdata_resource b ON a.resource_id = b.id
LEFT JOIN erp_base.rf_dictionary c ON b.house_keeper = c.id
GROUP BY a.comm_id, c.Title, resource_group, b.resource_type

SELECT a.comm_id, c.Title house_keeper_name, ( SELECT build.id FROM erp_base.tb_base_masterdata_resource AS resource INNER JOIN erp_base.tb_base_masterdata_resource AS unit ON unit.id = resource.parent_id INNER JOIN erp_base.tb_base_masterdata_resource AS build ON build.id = unit.parent_id WHERE resource.id = a.resource_id ) resource_group FROM tb_charge_receipts_detail a LEFT JOIN erp_base.tb_base_masterdata_resource b ON b.id = a.resource_id LEFT JOIN erp_base.rf_dictionary c ON b.house_keeper = c.id GROUP BY a.comm_id,c.Title,resource_group 这个sql在mysql中报this is incompatible with sql_mode=only_full_group_by是为什么该怎么改

该错误是因为 MySQL 的版本更新，默认启用了 `ONLY_FULL_GROUP_BY` 模式，这种模式下，`GROUP BY` 必须包含所有非聚合字段。

在这个 SQL 语句中，`SELECT` 子句中的字段 `resource_group` 不在 `GROUP BY` 中，因此 MySQL 报错。

解决这个问题的方法有两个：

1. 关闭 `ONLY_FULL_GROUP_BY` 模式
可以通过修改 MySQL 的配置文件 `my.cnf` 或者在命令行中输入如下语句来关闭该模式：

SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));

这种方法会影响到整个 MySQL 实例的行为，需要谨慎使用。

2. 将 `SELECT` 子句中的所有字段都放入 `GROUP BY` 中
可以将 SQL 语句修改为：

SELECT a.comm_id, c.Title as house_keeper_name, (
  SELECT build.id 
  FROM erp_base.tb_base_masterdata_resource AS resource 
  INNER JOIN erp_base.tb_base_masterdata_resource AS unit ON unit.id = resource.parent_id 
  INNER JOIN erp_base.tb_base_masterdata_resource AS build ON build.id = unit.parent_id 
  WHERE resource.id = a.resource_id
) as resource_group 
FROM tb_charge_receipts_detail a 
LEFT JOIN erp_base.tb_base_masterdata_resource b ON b.id = a.resource_id 
LEFT JOIN erp_base.rf_dictionary c ON b.house_keeper = c.id 
GROUP BY a.comm_id, c.Title, resource_group;

这种方法会使 SQL 语句更加冗长，但不会影响 MySQL 的全局设置。