在MySQL / Oracle数据库中切换布尔值

Question

Update myTable SET field = 1 (if field = 0 or if field is null) where myid = 12345;
Update myTable SET field = 0 (if field = 1) where myid = 12345;

What is the best way to transform this Pseudocode in proper SQL for Oracle and MySQL?

Answer 1

您可以像这样简单地使用模：

UPDATE myTable SET field = (field + 1) % 2 WHERE myId = 12345;

Answer 2

Due to the lack of a real boolean in both DBMS you need a case statement:

update myTable
   set the_column = case when the_column = 1 then 0 else 1 end
where myId = 12345;

This assumes that the column never has different values than 0 and 1