檢查表列名稱作爲where子句中的字符串SQL Server 2008

Question

我有一些映射列值存儲在表中。我想更新查詢像...

update table1 set table1.value = table2.columnValue 
from table2 
where table2's columnName = table1.ColumnNameValue 

Answer 1

請在兩個表進行JOIN像

update t1 
set [value] = t2.columnValue 
from table1 t1 
join table2 t2 on t2.columnName = t1.ColumnName