Need some SQL Stored proc help - joining - tsql

Question

So I have this section of my proc:
SELECT
com_contact.rc_name_full as CreatedBy,
capComponent.cm_strike as CapStrike,
floorComponent.cm_strike as FloorStrike,
tq_nominal_notional as Notional,
maxComponent.cm_effective_dt as EffectiveDate,
maxComponent.cm_maturity_dt as MaturityDate,
CAST(CAST(DATEDIFF(mm,maxComponent.cm_effective_dt,maxComponent.cm_maturity_dt) as decimal(9,2))/12 as decimal(9,2)) as term,
(
CASE WHEN se_amort_term_mnth IS NOT NULL THEN se_amort_term_mnth / 12
ELSE CAST(CAST(DATEDIFF(mm,
ISNULL(cmam_amortization_start_dt, maxComponent.cm_effective_dt),
cmam_amortization_end_dt) as decimal(9,2))/12 as decimal(9,2))
END
) AS AmortTermYears,
tq_dd_product as Product,
dh_key_rate as KeyRate,
dh_pv01 as PV01,
dh_val_time_stamp as RateTimeStamp,
re_bnk_le.re_company_name as Company,
rc_contact_id as UserId,
stp_name as NickName,
'' as project,
'' as Borrower,
'' as Lender,
'' as AdditionalInfo,
CASE WHEN tpm_pd_permission_id = 85 THEN 'LLH' WHEN tpm_pd_permission_id = 86 THEN 'ALM' ELSE '' END as Permission,
tr_transaction_id as TransactionId,
NULL as IndicationId
FROM cfo_transaction
The line that says '' as project, we have to actually change to return data now.
The table that next to the FROM, called cfo_transaction has an id on it called tr_transaction_id. We have another table called com_project_transaction_link, that links those id's with project id's, using two two columns called:
pt_tr_transaction_id and pt_pj_project_id, and then we have a table containing all the projects called com_project that has a pj_project_id and a pj_project_name.
GOAL: return the pj_project_name from that projects table where it links with the transactions being pulled.
I really don't know how to do this.
Thanks!

Answer 1

Try this:
SELECT
com_contact.rc_name_full as CreatedBy,
capComponent.cm_strike as CapStrike,
floorComponent.cm_strike as FloorStrike,
tq_nominal_notional as Notional,
maxComponent.cm_effective_dt as EffectiveDate,
maxComponent.cm_maturity_dt as MaturityDate,
CAST(CAST(DATEDIFF(mm,maxComponent.cm_effective_dt,maxComponent.cm_maturity_dt) as decimal(9,2))/12 as decimal(9,2)) as term,
(
CASE WHEN se_amort_term_mnth IS NOT NULL THEN se_amort_term_mnth / 12
ELSE CAST(CAST(DATEDIFF(mm,
ISNULL(cmam_amortization_start_dt, maxComponent.cm_effective_dt),
cmam_amortization_end_dt) as decimal(9,2))/12 as decimal(9,2))
END
) AS AmortTermYears,
tq_dd_product as Product,
dh_key_rate as KeyRate,
dh_pv01 as PV01,
dh_val_time_stamp as RateTimeStamp,
re_bnk_le.re_company_name as Company,
rc_contact_id as UserId,
stp_name as NickName,
PR.pj_project_name as project,
'' as Borrower,
'' as Lender,
'' as AdditionalInfo,
CASE WHEN tpm_pd_permission_id = 85 THEN 'LLH' WHEN tpm_pd_permission_id = 86 THEN 'ALM' ELSE '' END as Permission,
tr_transaction_id as TransactionId,
NULL as IndicationId
FROM cfo_transaction TR
INNER JOIN com_project_transaction_link TL
ON TR.tr_transaction_id = TL.pt_tr_transaction_id
INNER JOIN com_project PR
ON TL.pt_pj_project_id = PR.pj_project_id
The query above assumes that every transaction and project is on the table that joins your tables of projects and transactions (thus the INNER JOIN), but yo can change those to LEFT JOIN if you want

Answer 2

You just add a second join to the other table to the query.
select
yourfields,
p.pj_project_name as project
FROM cfo_transaction t
join com_project_transaction_link tl
on t.tr_transaction_id = tl.pt_tr_transaction_id
join com_project p
on tl.pt_pj_project_id = p.pj_project_id

Answer 3

SELECT ..., cp.pj_project_name
FROM cfo_transaction ct
INNER JOIN com_project_transaction_link cptl
ON ct.tr_transaction_id = cptl.pt_tr_transaction_id
INNER JOIN com_project cp
ON cptl.pt_pj_project_id = cp.pj_project_id