sql server - MSSQL Query optimization : remove functions from query and optimizing -


vm table

  • id
  • teacher1_id
  • teacher2_id

teacher table

  • id

teacherclass table

  • teacherid

  • classid

class table

  • id

uni table

  • id

  • name

  • classid

i want fetch vm.id, teacher1.id,teacher1_uni.id,teacher2.id,teacher2_uni.id

current query:

select  vm.id, vm.teacher1_id, getuni(vm.teacher1_id), vm.teacher2_id, getunit(vm.teacher2_id) vm

getuni(@teacherid):

select  u.id uni join class c on uni.classid = c.id join teacherclass tc on tc.classid = c.id tc.teacherid = @teacherid

the above query slow , return data after 21 seconds. kindly me speed up. suppose function calling making query slow. how optimize query?


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