筆記5 T-SQL技巧case when then end的update語句
1 --T-SQL技巧case when then end的update語句 2 declare @T table (name varchar(1),taici int) 3 insert into @T 4 select 'a',1 union all 5 select 'b',2 union all 6 select 'c',3 union all 7 select 'd',4 union all 8 select 'e',5 9 10 SELECT * FROM @T 11 12 update @T set taici= 13 case when taici=5 then 2 14 when taici<2 then taici 15 when taici>=2 then taici+1 16 when taici=2 then 5 end 17 18 select * from @T order by taici 19 /* 20 name taici 21 ---- ----------- 22 a 1 23 e 2 24 b 3 25 c 4 26 d 5 27 */