topic primary key explanation in SAS Programming

primary key explanation

swar — Fri, 21 Apr 2017 18:07:15 GMT

Can anyone explain this with example?

I am getting an error when defining composite primary key through proc sql create table statement. Always a problem with syntax but I cannot figure out what is the problem..

PRIMARY KEY (column-1 <, column-2, ...>)

specifies one or more primary key columns, that is, columns that do not contain missing values and whose values are unique.

Restriction

When you are defining overlapping primary key and foreign key constraints, the variables in a data file are part of both a primary key and a foreign key definition. If you use the exact same variables, then the variables must be defined in a different order.

Re: primary key explanation

Reeza — Fri, 21 Apr 2017 18:14:34 GMT

The code you're using and log with errors would be helpful here.

Re: primary key explanation

thomp7050 — Fri, 21 Apr 2017 18:29:42 GMT

After creating your table, execute this step:

PROC SQL;
ALTER TABLE MANUFACTURERS
ADD CONSTRAINT PRIM_KEY PRIMARY KEY (MANUNUM);
QUIT;

Re: primary key explanation

swar — Fri, 21 Apr 2017 21:10:44 GMT

This is the code I am executing.

The primary key should have claim_id,patient_id,Seq_no) but it is not executing

109 proc sql;

110 create table swar_am.diagnosis

111 (Claim_id char(6) references 'claims',

112 Patient_id char(6) references 'patient',

113 Seq_no char(6),

114 code_set char(50),

115 code char(20),

116 primary key(Seq_no,Claim_id,Patient_id);

---

ERROR 22-322: Syntax error, expecting one of the following: CHAR, CHARACTER, DATE, DEC, DECIMAL,

DOUBLE, FLOAT, INT, INTEGER, NUM, NUMERIC, REAL, SMALLINT, VARCHAR.

ERROR 76-322: Syntax error, statement will be ignored.

Re: primary key explanation

swar — Fri, 21 Apr 2017 21:29:27 GMT

This is another error.

142 proc sql;

143 create table swar_am.claims

144 (Patient_id char(6) references 'patient',

145 Claim_id char(6) ,

146 claim_type char(10),

147 dt_admission num format = mmddyy10.,

148 dt_discharge num format = mmddyy10.,

149 dt_service num format = mmddyy10.,

150 val_pmt_total num format= Dollar6.3)

151 ;

ERROR: Creation of integrity constraint _FK0001_ failed because half of the referential integrity

constraint would reside within a temporary library. WORK is a temporary library.

Here claim_id and patient_id should be primary key..

Re: primary key explanation

swar — Sat, 22 Apr 2017 03:50:24 GMT

Thank you. it worked