PROC SQL. By Becky Leung Alberta Health Services. Calgary SAS User Group Meeting Wednesday, October 08, 2014

Transcription

1 PROC SQL By Becky Leung Alberta Health Services Calgary SAS User Group Meeting Wednesday, October 08, 2014

2 WHAT IS PROC SQL? A Base SAS procedure that combines the functionality of DATA and PROC steps into a single step

3 WHAT CAN PROC SQL DO? Sort, summarize, subset, join (merge), and concatenate datasets Create new variables and print the results or create a new table or view within one step Retrieve, update and report on information from SAS datasets

4 SYNTAX PROC SQL; CREATE table-name view-name AS SELECT column(s) FROM table-name view-name WHERE expression GROUP BY columns(s) HAVING expression ORDER BY columns(s) ; QUIT;

5 MERGING TABLES IN PROC SQL We can merge two tables together within one step We can merge three or more tables together within one step

6 MERGING TWO TABLES

7 TABLE A A B TABLE B B C MERGE: ONE TO ONE

8 TABLE A TABLE B A B B C MERGE: ONE TO MANY 4 TABLE A TABLE B C B B A MERGE: MANY TO ONE

9 TABLE A TABLE B A B B C MERGE: MANY TO MANY

10 SYNTAX PROC SQL; CREATE table-name view-name AS SELECT column(s) FROM table-name view-name alias1 JOIN table-name view-name alias2 ON alias1.varible-name EQ alias2.variable-name ; QUIT;

11 TABLE A: HOSPITAL_ADMISSION OBS # PATIENT_ID HOSPITAL_ADMISSION_DATE JAN FEB JAN MAR SEP APR FEB DEC13 TABLE B: PATIENT_DEMOGRAPHICS OBS # PATIENT_ID BIRTHDATE CITY HOUSEHOLD_INCOME FEB53 CALGARY 60, OCT43 CALGARY 100, MAR43 CALGARY 25, JUN44 EDMONTON JAN44 EDMONTON 130,000

12

13 SYNTAX MERGING TWO TABLES PROC SQL; CREATE TABLE PATIENT_INFO1 AS SELECT A.*, B.BIRTHDATE FROM HOSPITAL_ADMISSION A LEFT JOIN PATIENT_DEMOGRAPHICS B ON A.PATIENT_ID EQ B.PATIENT_ID; QUIT;

14 RESULT TABLE: PATIENT_INFO1 OBS # PATIENT_ID HOSPITAL_ADMISSION_DATE BIRTHDATE Jan-13 1-Feb Feb-13 1-Feb Jan Oct Sep Oct Mar Oct Apr Mar Feb-13 1-Jun Dec-13 1-Jun-44

15 SYNTAX MERGING TWO TABLES PROC SQL; CREATE TABLE PATIENT_INFO2 AS SELECT A.*, B.BIRTHDATE FROM HOSPITAL_ADMISSION A RIGHT JOIN PATIENT_DEMOGRAPHICS B ON A.PATIENT_ID EQ B.PATIENT_ID; QUIT;

16 RESULT TABLE: PATIENT_INFO2 OBS # PATIENT_ID HOSPITAL_ADMISSION_ DATE BIRTHDATE Jan-13 1-Feb Feb-13 1-Feb Jan Oct Sep Oct Mar Oct Apr Mar Feb-13 1-Jun Dec-13 1-Jun Jan-44

17 SYNTAX MERGING TWO TABLES PROC SQL; CREATE TABLE PATIENT_INFO3 AS SELECT B.*, A.HOSPITAL_ADMISSION_DATE FROM HOSPITAL_ADMISSION A RIGHT JOIN PATIENT_DEMOGRAPHICS B ON A.PATIENT_ID EQ B.PATIENT_ID; QUIT;

18 RESULT TABLE: PATIENT_INFO3 OBS # PATIENT_ ID BIRTHDATE CITY HOUSEHOL D_IINCOME HOSPITAL_ ADMISSIO N_DATE Feb-53 CALGARY Jan Feb-53 CALGARY Feb Oct-43 CALGARY Jan Oct-43 CALGARY Sep Oct-43 CALGARY Mar Mar-43 CALGARY Apr Jun-44 EDMONTON 0 15-Feb Jun-44 EDMONTON 0 9-Dec Jan-44 EDMONTON

19 SYNTAX MERGING TWO TABLES PROC SQL; CREATE TABLE PATIENT_INFO3A AS SELECT B.*, A.HOSPITAL_ADMISSION_DATE FROM HOSPITAL_ADMISSION A RIGHT JOIN PATIENT_DEMOGRAPHICS B ON A.PATIENT_ID EQ B.PATIENT_ID WHERE HOUSEHOLD_IINCOME GT 0; QUIT;

20 RESULT TABLE: PATIENT_INFO3A OBS # PATIENT_ ID BIRTHDATE CITY HOUSEHOL D_IINCOME HOSPITAL_ ADMISSIO N_DATE Feb-53 CALGARY Jan Feb-53 CALGARY Feb Oct-43 CALGARY Jan Oct-43 CALGARY Sep Oct-43 CALGARY Mar Mar-43 CALGARY Apr Jan-44 EDMONTON

21 SYNTAX MERGING TWO TABLES PROC SQL; CREATE TABLE PATIENT_INFO4 AS SELECT A.PATIENT_ID AS PATIENT_ID_A LABEL="PATIENT ID A", B.PATIENT_ID AS PATIENT_ID_B LABEL="PATIENT ID B", HOSPITAL_ADMISSION_DATE LABEL="HOSPITAL ADMISSION DATE", B.BIRTHDATE LABEL="PATIENT BIRTHDATE FORMAT=DATE11. FROM HOSPITAL_ADMISSION A INNER JOIN PATIENT_DEMOGRAPHICS B ON A.PATIENT_ID EQ B.PATIENT_ID; QUIT;

22 RESULT TABLE: PATIENT_INFO4 OBS # PATIENT ID A PATIENT ID B HOSPITAL ADMISSION DATE PATIENT BIRTHDATE Jan-13 1-Feb Feb-13 1-Feb Jan Oct Sep Oct Mar Oct Apr Mar Feb-13 1-Jun Dec-13 1-Jun-1944

23 SYNTAX MERGING TWO TABLES PROC SQL; CREATE TABLE PATIENT_INFO5 AS SELECT FROM QUIT; A.PATIENT_ID AS PATIENT_ID_A LABEL="PATIENT ID A", B.PATIENT_ID AS PATIENT_ID_B LABEL="PATIENT ID B", HOSPITAL_ADMISSION_DATE LABEL="HOSPITAL ADMISSION DATE", B.BIRTHDATE LABEL= PATIENT BIRTHDATE FORMAT=DATE11., FLOOR((HOSPITAL_ADMISSION_DATE - BIRTHDATE)/365) AS AGE LABEL="PATIENT AGE" HOSPITAL_ADMISSION A FULL OUTER JOIN PATIENT_DEMOGRAPHICS B ON A.PATIENT_ID EQ B.PATIENT_ID;

24 RESULT TABLE: PATIENT_INFO5 OBS # PATIENT ID A PATIENT ID B HOSPITAL ADMISSION DATE PATIENT BIRTHDATE Jan-13 1-Feb Feb-13 1-Feb Jan Oct Sep Oct Mar Oct Apr Mar Feb-13 1-Jun Dec-13 1-Jun Jan PATIENT AGE

25 REFERENCES

26 THANK YOU