How to generate a query involving multiple tables(one left join others)

Hi, all,
I want to query a db like these:
I need all the demographics information(from table demo) and their acr info(from table acr), and their clinical info(from table clinical), and their lab info(from table lab).
The db is like this:
demo->acr: one to many
demo->clinical info: one to many
demo->lab info: one to many
I want to get one query result which are demo left join acr, and demo left join clinical, and demo left join lab. I hope the result is a record including demo info, acr info, clinical info, and lab info.
How could I do this in SQL?
Thanks a lot!
Qian

Thank you very, very much!
Actually, I need a huge query to include all the tables in our db.
We are running a clinical db which collects the patients demographics info, clinical info, lab info, and many other information.
The Demographics table is a center hub which connects other tables. This is the main architecture.
My boss needed a huge query to include all the information, so others could find what they need by filtering.
As you have found, because one patients usually has multiple clinical/lab info sets, so the result will be multiplied! the number of result=n*m*k*...
My first plan is to set time point criteria to narrow all the records with one study year. If somebody needs to compare them, then I have to show them all.
So I have to know the SQL to generate a huge query including as many tables as possible.
I show some details here:
CREATE TABLE "IMMUNODATA"."DEMOGRAPHICS" (
"SUBJECTID" INTEGER NOT NULL,
"WORKID" INTEGER,
"OMRFHISTORYNUMBER" INTEGER,
"OTHERID" INTEGER,
"BARCODE" INTEGER,
"GENDER" VARCHAR2(1),
"DOB" DATE,
"RACEAI" INTEGER,
"RACECAUCASIAN" INTEGER,
"RACEAA" INTEGER,
"RACEASIAN" INTEGER,
"RACEPAC" INTEGER,
"RACEHIS" INTEGER,
"RACEOTHER" VARCHAR2(50),
"SSN" VARCHAR2(11),
PRIMARY KEY("SUBJECTID") VALIDATE
CREATE TABLE "IMMUNODATA"."ACR" (
"ID" INTEGER NOT NULL,
"THEDATE" DATE ,
"SUBJECTID" INTEGER NOT NULL,
"ACR_PAGENOTCOMPLETED" VARCHAR2(1000) ,
"ACR_MALARRASHTODAY" INTEGER ,
"ACR_MALARRASHEVER" INTEGER ,
"ACR_MALARRSHEARLIESTDATE" DATE ,
PRIMARY KEY("ID") VALIDATE,
FOREIGN KEY("SUBJECTID") REFERENCES "IMMUNODATA"."DEMOGRAPHICS" ("SUBJECTID") VALIDATE
CREATE TABLE "IMMUNODATA"."CLIN" (
"ID" INTEGER NOT NULL,
"THEDATE" DATE ,
"SUBJECTID" INTEGER NOT NULL,
"CLIN_PAGENOTCOMPLETED" VARCHAR2(1000) ,
"CLIN_FATIGUE" VARCHAR2(20) ,
"CLIN_FATIGUEDATE" DATE ,
"CLIN_FEVER" VARCHAR2(20) ,
"CLIN_FEVERDATE" DATE ,
"CLIN_WEIGHTLOSS" VARCHAR2(20) ,
"CLIN_WEIGHTLOSSDATE" DATE ,
"CLIN_CARDIOMEGALY" VARCHAR2(20) ,
PRIMARY KEY("ID") VALIDATE,
FOREIGN KEY("SUBJECTID") REFERENCES "IMMUNODATA"."DEMOGRAPHICS" ("SUBJECTID") VALIDATE
Other tables are alike.
Thank very much!
Qian

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SQL query involving multiple tables

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