Sql subquery for DB2 -


the sql query requires 4 tables joined, did, , have display few columns out of them satisfy condition. query in clause. how write subquery.. display column (org_name,that there in org_unit) contents based on rows satified query in clause. wrote code, not working me:

select t33.contract_num, t135.minor_org_num, t96.org_type,t22.cfd_flag,   (select t96.org_name    org_unit t96, sub_unit t135    t96.org_number in (t135.major_org_number)) head_org_name    org_unit t96, sub_unit t135, cust_contract t33, cont_assignmt t22    t96.org_number = t22.org_number   , t22.ctr_sys_num = t33.ctr_sys_num   , t96.org_number = t135.minor_org_number   , t135.reltn_type = 'hos'   , t22.cfd_flag = 'y';

for record, t135 contains head offices numbers (major_org_number) , sub - offices numbers (minor_org_number)

in sql, use join "merge" tables based on common columns.

here simple guide give base idea: sql join

in sql, it's best draw want do, refer link see "left join" picture example: left join

using "left join" merge tables (where : org_unit.org_number = sub_unit.major_org_number), this:

left join sub_unit t135 on t96.org_number = t135.major_org_number

in query, put join right after "from", , before "where":

select      t33.contract_num,     t135.minor_org_num,     t96.org_type,     t22.cfd_flag,     t135.org_name head_org_name     org_unit t96,     cust_contract t33,     cont_assignmt t22  left join sub_unit t135 on t96.org_number = t135.major_org_number      t96.org_number = t22.org_number     , t22.ctr_sys_num = t33.ctr_sys_num     , t96.org_number = t135.minor_org_number     , t135.reltn_type = 'hos'     , t22.cfd_flag = 'y';

notice, (and should) use join merging tables (and avoiding using expensive condition):

select      t33.contract_num,     t135.minor_org_num,     t96.org_type,     t22.cfd_flag,     t135.org_name head_org_name      org_unit t96  left join sub_unit t135 on     t96.org_number = t135.major_org_number     , t96.org_number = t135.minor_org_number left join  on     cont_assignmt t22 on t96.org_number = t22.org_number left join on      cust_contract t33 on t22.ctr_sys_num = t33.ctr_sys_num      t135.reltn_type = 'hos'     , t22.cfd_flag = 'y';

there several join types (left/right/inner/outer), see using 1 need.


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