Sql 从具有不同关键字的同一列复制列中的值

我在博士后有下表

id | col1         |col2      |col3  |col4
66 | AfBLy_2_d1_1 | Sample |6798  | Day 1  
67 | AfBLy_2_d1_6 | Sample |8798 | Day 2  
66 | AfBLy_2_d1_4 | Sample |6776 | Day 7  
69 | AfBLy_2_d1_9 | Sample |6789 | Day 5  

66 | AfBLy_2_d1_1 | Sample Type  |  | Day 1
69 | AfBLy_2_d1_6 | Sample Type |  | Day 2  
66 | AfBLy_2_d1_4 | Sample Type |  | Day 7  
67 | AfBLy_2_d1_9 | Sample Type |   | Day 5  

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如何将第3列col2=Sample的值复制到第3列col2=Sample Type对应的col1和id值

with cte as (
    select * from your_table
    where col2 = 'Sample'
)
update your_table as t1
set t1.col3 = t2.col3
from cte as t2
where t1.col2 = 'Sample Type'
and t1.col1 = t2.col1
and t1.id = t2.id;

---

您可以如下方式更新表：

with cte as (
    select * from your_table
    where col2 = 'Sample'
)
update your_table as t1
set t1.col3 = t2.col3
from cte as t2
where t1.col2 = 'Sample Type'
and t1.col1 = t2.col1
and t1.id = t2.id;