select t1.c_id c_id1, t2.c_id c_id2 from pro t1, pro t2 where t1.c_id < t2.c_id and t1.f_id = t2.f_id;

这是一个 MySQL 查询语句，用于在 pro 表中找出持有相同基金的用户对，并按照用户 ID 排序。查询结果包括两个用户 ID，其中 c_id1 < c_id2。查询中使用了自连接和比较运算符。首先，在 WHERE 子句中，通过自连接将 pro 表连接两次，分别表示两个不同的用户。然后，限制 c_id1 小于 c_id2，避免重复查询。最后，通过比较 f_id 字段，筛选出持有相同基金的用户对。

相关问题

SELECT t1.id, t1.[requestId] AS t1_requestId, t1.[gf] AS '供方', t1.[htmc] AS '合同名称', t1.[htbh] AS '合同编号', t1.[sjbh] AS '编号', t1.[qdrq] AS '签订日期', t1.[qsrq] AS '起始日期', t1.[jzrq] AS '截止日期', t1.[zje] AS '总金额', t1.[zds] AS '总吨数', t1.[rksj] AS '入库时间', t1.[chpt] AS '撮合平台', t1.[htwj] AS '合同文件', t1.[qsfs] AS '签署方式', t1.[gfjc] AS '供方简称', t1.[cclx] AS '持仓类型' STUFF( ( SELECT ',' + CONVERT (VARCHAR, CASE WHEN ISNUMERIC(REPLACE(t2.hsdj, ',', '')) = 1 THEN CAST(REPLACE(t2.hsdj, ',', '') AS FLOAT) END ) FROM formtable_main_43_dt1 t2 WHERE t1.id = t2.mainid FOR XML PATH('') ), 1, 1, '' ) AS MergedValues FROM formtable_main_43 t1 INNER JOIN formtable_main_43_dt1 t2 ON t1.id = t2.mainid GROUP BY t1.id, t1.[requestId] AS t1_requestId, t1.[gf] AS '供方', t1.[htmc] AS '合同名称', t1.[htbh] AS '合同编号', t1.[sjbh] AS '编号', t1.[qdrq] AS '签订日期', t1.[qsrq] AS '起始日期', t1.[jzrq] AS '截止日期', t1.[zje] AS '总金额', t1.[zds] AS '总吨数', t1.[rksj] AS '入库时间', t1.[chpt] AS '撮合平台', t1.[htwj] AS '合同文件', t1.[qsfs] AS '签署方式', t1.[gfjc] AS '供方简称', t1.[cclx] AS '持仓类型' ，提示“STUFF”附近有语法错误。 (102) [42000] [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]关键字 'FOR' 附近有语法错误

您需要在 STUFF 函数的第一个参数和第二个参数之间添加一个逗号，用于分隔这两个参数。同时，您需要为 STUFF 函数指定一个别名，否则会报错。请尝试使用以下 SQL 查询语句：

SELECT t1.id, 		
        t1.[requestId] AS t1_requestId, 		
        t1.[gf] AS '供方', 		
        t1.[htmc] AS '合同名称', 		
        t1.[htbh] AS '合同编号', 		
        t1.[sjbh] AS '编号', 		
        t1.[qdrq] AS '签订日期', 		
        t1.[qsrq] AS '起始日期', 		
        t1.[jzrq] AS '截止日期', 		
        t1.[zje] AS '总金额', 		
        t1.[zds] AS '总吨数', 		
        t1.[rksj] AS '入库时间', 		
        t1.[chpt] AS '撮合平台', 		
        t1.[htwj] AS '合同文件', 		
        t1.[qsfs] AS '签署方式', 		
        t1.[gfjc] AS '供方简称', 		
        t1.[cclx] AS '持仓类型',     
        STUFF(
            (
                SELECT ',' + CONVERT (VARCHAR,
                    CASE 
                        WHEN ISNUMERIC(REPLACE(t2.hsdj, ',', '')) = 1 THEN 
                            CAST(REPLACE(t2.hsdj, ',', '') AS FLOAT) 
                    END
                ) 
                FROM formtable_main_43_dt1 t2 
                WHERE t1.id = t2.mainid 
                FOR XML PATH('')
            ), 1, 1, ''
        ) AS MergedValues 
FROM formtable_main_43 t1 
INNER JOIN formtable_main_43_dt1 t2 ON t1.id = t2.mainid 
GROUP BY t1.id, t1.[requestId], t1.[gf], t1.[htmc], t1.[htbh], t1.[sjbh], t1.[qdrq], t1.[qsrq], t1.[jzrq], t1.[zje], t1.[zds], t1.[rksj], t1.[chpt], t1.[htwj], t1.[qsfs], t1.[gfjc], t1.[cclx], MergedValues;

请注意，使用 GROUP BY 时需要指定所有 SELECT 字段的列名，这些列名需要与 SELECT 子句中的列名一致。

SELECT t1.organization_id, t1.organization_name, SUM( t2.jl_amount ) yfSjAmount, SUM( t2.sj_amount ) yfJlAmount, SUM( t3.money ) yfSectionAmount, SUM( t3.mileage ) yfSectionLength FROM main_project t1 LEFT JOIN mat_approval_project t2 ON t2.main_id = t1.id LEFT JOIN mat_project_pavement_approval t3 ON t3.project_id = t2.id WHERE t1.project_general_name = '预防性养护' AND t1.project_category_name = '路面工程' AND t1.process_status = '100' AND t1.organization_id = 'b3f029fa-62ab-476e-9876-b87ce69c41c5' AND t1.project_year = '2023' SQL统计错误，请修改

这条SQL语句缺少结束符号，可以在语句末尾添加分号（;）来解决。

完整的SQL语句应该是：

SELECT t1.organization_id, t1.organization_name, SUM(t2.jl_amount) yfSjAmount, SUM(t2.sj_amount) yfJlAmount, SUM(t3.money) yfSectionAmount, SUM(t3.mileage) yfSectionLength
FROM main_project t1
LEFT JOIN mat_approval_project t2 ON t2.main_id = t1.id
LEFT JOIN mat_project_pavement_approval t3 ON t3.project_id = t2.id
WHERE t1.project_general_name = '预防性养护'
  AND t1.project_category_name = '路面工程'
  AND t1.process_status = '100'
  AND t1.organization_id = 'b3f029fa-62ab-476e-9876-b87ce69c41c5'
  AND t1.project_year = '2023';