How to properly JOIN three different queries - sql

Question

I am using SQL Server 2008. I have three different queries that I would like to union together, but am unsure of how to properly go about it, as the structure of the queries are different.
My first query, creates two tables to insert records into for a comparison, where the MAX of a column for a visit is returned. Ex:
Query:
SET ANSI_NULLS OFF
GO
-- VARIABLE DECLARATION
DECLARE #STARTDATE DATETIME
DECLARE #ENDDATE DATETIME
-- VARIABLE INITIALIZATION
SET #STARTDATE = '6/1/12';
SET #ENDDATE = '1/1/13';
--#############################################################################################
-- TABLE DECLARATION WHICH WILL BE USED TO GET THE MAX ORDERED DATE #
-- #
DECLARE #T1 TABLE (ENCOUNTER VARCHAR(200), PT_NAME VARCHAR(500), MRN VARCHAR(200), --#
LOS VARCHAR(200), PT_LOC VARCHAR(500), PT_DISPO VARCHAR(500), --#
LAB_NAME VARCHAR(500), LAB_VALUE VARCHAR(40),LOWER_LIMIT VARCHAR(30), --#
UPPER_LIMIT VARCHAR(30), HISTORY VARCHAR(10), HAS_HISTORY VARCHAR(10), --#
AB_CODE VARCHAR(30), ORDER_ENTERED VARCHAR(500)) --#
DECLARE #T2 TABLE (ENCOUNTER2 VARCHAR(200), PT_NAME2 VARCHAR(500), MRN2 VARCHAR(200), --#
LOS2 VARCHAR(200), PT_LOC2 VARCHAR(500), PT_DISPO2 VARCHAR(500), --#
LAB_NAME2 VARCHAR(500), LAB_VALUE2 VARCHAR(40),LOWER_LIMIT2 VARCHAR(30), --#
UPPER_LIMIT2 VARCHAR(30), HISTORY2 VARCHAR(10), HAS_HISTORY2 VARCHAR(10),--#
AB_CODE2 VARCHAR(30), ORDER_ENTERED2 VARCHAR(500)) --#
-- #
--#############################################################################################
--## TABLE INSERTIONS ##
--###########################################################################################
--## WHAT GETS PUT INTO TABLE 1 ##
INSERT INTO #T1
SELECT
A.VisitIDCode,
A.ClientDisplayName,
A.IDCode,
A.LOS,
A.CurrentLocation,
A.DischargeDisposition,
A.ItemName,
A.Value,
A.ReferenceLowerLimit,
A.ReferenceUpperLimit,
A.IsHistory,
A.HasHistory,
A.AbnormalityCode,
A.Entered
FROM
(
-- COLUMN SELECTION
SELECT CV.VisitIDCode, CV.ClientDisplayName, CV.IDCode,DATEDIFF(DD,CV.ADMITDTM,CV.DISCHARGEDTM)AS 'LOS',
CV.CurrentLocation, CV.DischargeDisposition, BO.ItemName, BO.Value,
BO.ReferenceLowerLimit, BO.ReferenceUpperLimit, BO.IsHistory, BO.HasHistory, BO.AbnormalityCode,
BO.Entered
-- DB USED: SCM
FROM CV3ClientVisit CV
JOIN CV3BasicObservation BO
ON CV.GUID = BO.ClientVisitGUID
WHERE CV.AdmitDtm BETWEEN #STARTDATE AND #ENDDATE
AND CV.TypeCode = 'INPATIENT'
AND BO.Value IS NOT NULL
AND (BO.ItemName LIKE '%SODIUM LEVEL%'
OR BO.ITEMNAME LIKE '%HEMOG%')
)A
--## TABLE INSERTIONS ##
--###########################################################################################
--## WHAT GETS PUT INTO TABLE 2 ##
INSERT INTO #T2
SELECT
B.VisitIDCode,
B.ClientDisplayName,
B.IDCode,
B.LOS,
B.CurrentLocation,
B.DischargeDisposition,
B.ItemName,
B.Value,
B.ReferenceLowerLimit,
B.ReferenceUpperLimit,
B.IsHistory,
B.HasHistory,
B.AbnormalityCode,
B.Entered
FROM
(
-- COLUMN SELECTION
SELECT CV.VisitIDCode, CV.ClientDisplayName, CV.IDCode,DATEDIFF(DD,CV.ADMITDTM,CV.DISCHARGEDTM) AS 'LOS',
CV.CurrentLocation,CV.DischargeDisposition, BO.ItemName, BO.Value,BO.ReferenceLowerLimit, BO.ReferenceUpperLimit,
BO.IsHistory, BO.HasHistory, BO.AbnormalityCode,BO.Entered
-- DB USED: SCM
FROM CV3ClientVisit CV
JOIN CV3BasicObservation BO
ON CV.GUID = BO.ClientVisitGUID
WHERE CV.AdmitDtm BETWEEN #STARTDATE AND #ENDDATE
AND CV.TypeCode = 'INPATIENT'
AND BO.Value IS NOT NULL
AND (BO.ItemName LIKE '%SODIUM LEVEL%'
OR BO.ITEMNAME LIKE '%HEMOG%')
)B
--###########################################################################################
--## HERE IS WHERE WE DO TABLE COMPARISONS ##
SELECT
DISTINCT T1.ENCOUNTER,
T1.PT_NAME AS 'PT NAME', T1.MRN AS 'MRN', T1.LOS AS 'LOS', T1.PT_LOC AS 'PT LOC',
T1.PT_DISPO AS 'PT DISPO', T2.LAB_NAME2 AS 'LAB NAME', T2.LAB_VALUE2, T2.LOWER_LIMIT2 AS 'LOWER LIMIT',
T2.UPPER_LIMIT2 AS 'UPPER LIMIT', T2.AB_CODE2 AS 'AB CODE', T2.ORDER_ENTERED2
FROM #T1 T1
JOIN #T2 T2
ON T1.MRN = T2.MRN2
WHERE
T1.ENCOUNTER = T2.ENCOUNTER2
AND T1.ORDER_ENTERED < T2.ORDER_ENTERED2
AND T2.ORDER_ENTERED2 = (
SELECT MAX(TEMP.ORDER_ENTERED2)
FROM #T2 TEMP
WHERE T1.MRN = TEMP.MRN2
)
Results
CLIENT ID VISIT ID ARRIVE DATE VALUE DATE VALUE ORDERED
.......................................................................
1 | 1 | 1/1/13 | 5 | 1/1/13
1 | 1 | 1/1/13 | 6 | 1/2/13 <- returned row
Where this query will return the row with the date value ordered of 1/2/13.
The second query counts for me how many times the Client in the Client ID column came inside of a 12 month time frame. So for the above it would return something like
Query 2:
-- VARIABLE DECLARATION
DECLARE #STARTDATE DATETIME
DECLARE #ENDDATE DATETIME
-- INITIALIZE VARIABLES
SET #STARTDATE = '6/1/12';
SET #ENDDATE = '1/1/13';
-- COLUMN SELECTION
SELECT DISTINCT CV.IDCode AS 'MRN', COUNT(CV.IDCODE) AS 'COUNT OF IP VISITS'
FROM CV3ClientVisit CV
WHERE CV.AdmitDtm BETWEEN #STARTDATE AND #ENDDATE
AND CV.TypeCode LIKE '%INPATIENT'
AND CV.VisitStatus IN(
'ADM',
'DSC'
)
GROUP BY CV.IDCode
ORDER BY COUNT(CV.IDCode) DESC
Results:
Client ID Count of Visits
...............................
1 | 2
The third and final query tells me how many times they did something, for example
Query 3:
Declare #procedures Table (MRN varchar(20), Patient varchar(80), VisitID varchar(20), Admit datetime, Disch datetime, SurgProc varchar(200), ProcDesc varchar(200))
insert into #procedures
select cv.IDCode,cv.ClientDisplayName,cv.VisitIDCode,AdmitDtm,cv.DischargeDtm,ed.Description,ed.text from CV3ClientVisit cv
left join cV3ClientEventDeclaration ed
on cv.GUID=ed.ClientVisitGUID
where ed.typecode = 'Surgery'
and cv.AdmitDtm > '6/30/12' and cv.AdmitDtm <='1/1/13'
and Status = 'Active'
select visitid, COUNT(visitid)as '#Surg Procs' from #procedures
group by visitid
Results:
CLIENT ID VISIT ID ARRIVE DATE DEPART DATE COUNT OF PR VISITS
...............................................................................
1 | 1 | 1/1/13 | 1/3/13 | 3
So my question is, how do I properly JOIN all of these queries together in order to get just one result? There will be times where a client may not have a result for one of the queries.
I would like to final header to look something like this:
CLIENT ID | CLIENT VISIT ID | CLIENT NAME | LOS | PT LOC | PT DISPO | LAB NAME | LAB VALUE | LOWER LIMIT | UPPER LIMIT | AB CODE | COUNT OF IP VISITS | COUNT OF PROCEDURES
Thank You

Answer 1

OK. I'll give you a hint.
Let say you have two SELECT-type queries.
First returns: Last Name, First Name, Date of Birth.
Second returns: Last Name, First Name, Address, Occupation
You want the result as: Last Name, First Name, Occupation, Date of Birth, Address
You will do something like this:
SELECT LastName, FirstName, NULL, DOB, NULL FROM ...
UNION
SELECT LastName, FirstName, Occupation, NULL, Address FROM ...