MySQL每列的最小值和最大值

我可以运行以下操作来动态标识表中具有许多列的所有十进制字段：

SELECT COLUMN_NAME, DATA_TYPE
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME='tbl_name' AND DATA_TYPE = 'decimal'

如何提取这些字段的最小值和最大值？e、 g.最终输出，如：

COLUMN_NAME  DATA_TYPE  MIN_VAL  MAX_VAL
a            decimal    4        22
b            decimal    18       5593
c            decimal    1        299

---

更新：

这是我用来让它工作的最后一个语法。也许我错过了一个更简单的方法，但这是可行的，所以感谢戈登·林诺夫的回答

set @sql = concat('SELECT ', @cols, ' FROM ', @t);

SELECT @sql := GROUP_CONCAT(REPLACE(REPLACE(@sql, @cols,
                                            CONCAT('"', COLUMN_NAME, '" as TheCol', ', ', '"', DATA_TYPE, '" as TheDType', ', ',
                                                   'MIN(', COLUMN_NAME, ') as TheMin, MAX(', COLUMN_NAME, ') as TheMax'
                                                  )
                                           ),
                                    @t, 'tbl_name') SEPARATOR ' union all '
                            )              
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME='tbl_name' AND DATA_TYPE = 'decimal';

prepare s from @sql;
execute s;
deallocate prepare s;

---

您需要使用动态sql：

set @sql = 'SELECT @cols FROM @t';

SELECT @sql := GROUP_CONCAT(REPLACE(REPLACE(@sql, @cols,
                                            CONCAT(COLUMN_NAME, ', ', DATA_TYPE, ', ',
                                                   'MIN(', COLUMN_NAME, '), MAX(', COLUMN_NAME, ')'
                                                  )
                                           ),
                                    @t, 'tbl_name') SEPARATOR ' union all '
                            )              
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME='tbl_name' AND DATA_TYPE = 'decimal';

prepare s from @sql;
execute s;
deallocate prepare s;

---

您需要使用动态sql：

set @sql = 'SELECT @cols FROM @t';

SELECT @sql := GROUP_CONCAT(REPLACE(REPLACE(@sql, @cols,
                                            CONCAT(COLUMN_NAME, ', ', DATA_TYPE, ', ',
                                                   'MIN(', COLUMN_NAME, '), MAX(', COLUMN_NAME, ')'
                                                  )
                                           ),
                                    @t, 'tbl_name') SEPARATOR ' union all '
                            )              
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME='tbl_name' AND DATA_TYPE = 'decimal';

prepare s from @sql;
execute s;
deallocate prepare s;

---

编写基于tableName和ColumnName的动态SQL语句以获取最小-最大值。编写基于tableName和ColumnName的动态SQL语句以获取最小-最大值。在

分隔符上抛出语法错误。显然，我在引用的2个位置替换了实际的表名-是否需要任何其他更改？在
分隔符上抛出语法错误。很明显，我在引用的两个地方替换了实际的表名-是否需要其他更改？