SQL行转列式查询

select
max(CASE name WHEN 'wks' THEN  a.num else 0 end) 'wks',
max(CASE name WHEN 'jxz' THEN  a.num else 0 end) 'jxz',
max(CASE name WHEN 'dpj' THEN  a.num else 0 end) 'dpj',
max(CASE name WHEN 'ywc' THEN  a.num else 0 end) 'ywc',
max(CASE name WHEN 'zt' THEN  a.num else 0 end) 'zt'
from(
select 'wks' name,COUNT(1) num from TaskList where TaskStates='未开始' and isDel=0
UNION ALL
select 'jxz' name,COUNT(1) num from TaskList where TaskStates='进行中' and isDel=0
UNION ALL
select 'dpj' name,COUNT(1) num from TaskList where TaskStates='待评价' and isDel=0
UNION ALL
select 'ywc' name,COUNT(1) num from TaskList where TaskStates='已完成' and isDel=0
UNION ALL
select 'zt' name,COUNT(1) num from TaskList where TaskStates='暂停' and isDel=0
) a

类似这样的查询可以一次性的从数据库中取出多个结果集，避免了多次链接数据库。