Can a composite key be null?

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write a query to find out the no. of employees whose age is less than 25 and max of salary for the employees belonging to a particular department is less than 20000

6 Answers  

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How to return multiple records from procedure?

2 Answers  

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When a dml statement is executed, in which cursor attributes, the outcome of the statement is saved?

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How you can copy a file to file content and file to pl/sql table in advance pl/sql?

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Why you are not able to create a table using select command,if it is having a LONG column? for eg:create table test as select * from test1 here test1 containg a column having LONG datatype...

1 Answers  

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What is meant by user defined function?

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Hi Guys, I have a situation where I need to access the column values from rowtype variable. However, the column names are dynamic. below is sample code: declare Cursor c1 is select * from emp; Cursor c2 is select column_name from xyztable; v_c2 c2%rowtype; v_str varchar2 v_value varchar2(200); begin for rec in c1 loop open c2;---this cursor has column names like EMPLOYEE_ID, FIRST_NAME, LAST_NAME etc. loop fetch c2 into v_c2; exit when c2%notfound; /* now lets say i want to access value of LAST_NAME from cursor c1, so I am writing below code, however it does not work as expected */ v_str:= 'rec.'|| v_c2.column_name; -- this will give me string like "rec.EMPLOYEE_ID" v_value:=v_str; end loop; end loop; end; / Plz help ASAP.Thanks.

2 Answers  

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What are the differences between implicit and explicit cursors?

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How many types of normalization are there?

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select top 3 sal from each dept?

17 Answers   IBM, TCS,

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what is heap table? : Sql dba

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