how mysql optimizes distinct? : Sql dba

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Which data dictionary views have the information on the triggers that are available in the database?

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What is a parameter query?

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Explain architecture of sql server notification services?

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How does sql profiler work?

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Is sql a programming?

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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.

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Which table is left in left join?

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What are some emotional triggers?

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describe transaction-safe table types in mysql : sql dba

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What is the use of time stamp in select statement?

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Define implicit and explicit cursors.

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