Question

我有一个数据表，其中一些数据如下所示。

Table name Uk_Small_Stage1

name                                             created    1m  
IA UK Smaller Companies                          17/10/2017 3.9
Jupiter UK Smaller Companies I Acc               17/10/2017 6.96
Old Mutual UK Smaller Companies Focus R Inc GBP  17/10/2017 2.19
TB Amati UK Smaller Companies B Acc              17/10/2017 4.85
TM Cavendish AIM B                               17/10/2017 2.34

我希望将表格转换为

Created  IA UK Smaller Companies  Jupiter UK Smaller Companies I Acc  Old Mutual UK Smaller Companies Focus R Inc GBP
17/10/2017      3.9                         6.96                        2.19

（对于字段＆＃34; name＆＃34;。

，每行应显示一列

Uk_Small_Stage1每个日期都有多条记录。

我正在尝试使用下面的代码，它应该动态构建并执行数据库，但是我遇到了mysql错误。

请问有人帮忙吗？

SET group_concat_max_len=2048; 
SET @sql = NULL;
SELECT
  GROUP_CONCAT(DISTINCT
    CONCAT(
      'MAX(IF(name = ''',
      name,
      ''', 1m, NULL)) AS ‘,
CONCAT("`”,name,"`")
)
    )
  ) INTO @sql
FROM UK_Small_Stage1;
SET @sql = CONCAT('SELECT created, ', @sql, ' FROM UK_Small_Stage1 GROUP BY created’);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

最新代码

SET group_concat_max_len=2048; 
SET @sql = NULL;
SELECT
  GROUP_CONCAT(DISTINCT
    CONCAT(
      'MAX(IF(name = ''',
      name,
      ''', 1m, NULL)) AS ‘,
CONCAT(''',name,''')
)
    )
  ) INTO @sql
FROM UK_Small_Stage1;
SET @sql = CONCAT('SELECT created, ', @sql, ' FROM UK_Small_Stage1 GROUP BY created’);
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

Mysql将行转到列

0 个答案: