Can a table have two primary keys?
Answers were Sorted based on User's Feedback
Answer / anand
Yes table can have two or more primary key,when we want to
create more then one primary we use unique constranit with
not null or we can create with triggre.
Is This Answer Correct ? | 1 Yes | 6 No |
Yes table can have two or more primary key.
Is This Answer Correct ? | 1 Yes | 9 No |
Answer / ashwin kumar
yes, a table may have more than 1 primary keys but, of them
we only choose 1 column as identifiable column called
primary key. The other columns are called surrogate keys or
candidate key.
Is This Answer Correct ? | 25 Yes | 43 No |
Answer / jamalvalli
Yes we can use. for Example
create table emp(empno number(5), ename varchar2(20),
deptno number(5) add primary key Pk_constraint( empno,
deptno))
Is This Answer Correct ? | 18 Yes | 38 No |
How to order siblings in oracle hierarchy queries?
How to get help at the sql prompt?
there are 2 variables called x and y ,x contains 1,2 and y contains 3,4 we have to swap the values from x to y and y to x with out using dummy variables and it can be done only by using a single statement ? how?
Is sql low level language?
what is auto increment? : Sql dba
create or replace procedure search_matter(empno varchar2) as sql_stmt varchar2(200); stmt varchar2(200); v_table_name varchar2(200); val_pres number; inp_value varchar2(200); type obj_typ is table of cols.column_name%type index by binary_integer; type all_col is table of varchar2(100) index by binary_integer; typ_obj_typ obj_typ; typ_all_col all_col; begin select object_name bulk collect into typ_obj_typ from user_tables,user_objects where table_name = object_name AND object_type = 'TABLE'; select empno into inp_value from dual; dbms_output.put_line('inp value : '||inp_value); for i in typ_obj_typ.first..typ_obj_typ.last loop v_table_name := NULL; v_table_name := typ_obj_typ(i); dbms_output.put_line(i||':'||typ_obj_typ(i)); dbms_output.put_line('....................'); sql_stmt := 'select column_name from cols where table_name = :1 and data_type in (''CHAR'', ''VARCHAR2'', ''NCHAR'', ''NVARCHAR2'',''NUMBER'')'; EXECUTE IMMEDIATE sql_stmt bulk collect into typ_all_col using typ_obj_typ(i); for inside in typ_all_col.first..typ_all_col.last loop dbms_output.put_line('sql stmt: '||sql_stmt); dbms_output.put_line('column name: '||typ_all_col(inside)||'table name: '||typ_obj_typ(i)); stmt := 'select count(*) from ||typ_obj_typ(i)||'; EXECUTE_IMMEDIATE stmt into val_pres ; if val_pres = 1 then dbms_output.put_line('value present col name: '||typ_all_col(inside)||'table name :'||typ_obj_typ(i)); end if; end loop; dbms_output.put_line('....................'); end loop; exception when others then dbms_output.put_line('sql code '||sqlcode||'Table name: '||v_table_name); dbms_output.put_line('sql message '||sqlerrm); end; Compile-time I am getting below error, Plz help to resolve. LINE/COL ERROR -------- ----------------------------------------------------------------- 47/23 PLS-00103: Encountered the symbol "STMT" when expecting one of the following: := . ( @ % ;
Easy way to convert tableau "IF - ELSEIF" statements to Netezza "CASE" statements.
how to calcuate the second highest salary of he employee
How to set up sql*plus output format in oracle?
Differentiate between sga and pga.
What is trigger in pl sql with examples?
How do you break a loop in pl sql?