Is primary key is clustered index?

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what are the properties and different types of sub-queries? : Sql dba

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1. what is the exact use of hint in sql. 2. How we can avoid index scan in sql even though index is there in the table.

1 Answers   Polaris,

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What is a CTE (Common Table Expression), and how is it different from a subquery?

3 Answers  

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There are 5 records in a table and we have implemented two triggers that are :pre_query and post_query how many times these triggers will fire.

2 Answers   Maruti Suzuki,

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What is the benefit of foreign key?

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What are the components of a PL/SQL block ?

3 Answers  

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How can we schedule the procedure to run automatically ?

3 Answers  

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How to use sql*plus built-in timers?

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What are %type and %rowtype for?

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Let us suppose we have a table with structure in order empno empname empdesig empcountry and now i want to re-organize the columns of this table to empno empdesig empname empcountry how can i do this with queries ? assume that table contains the data.

3 Answers  

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Table 1: col1 Timestamp ---------------- 01-mar-2012 11:12:46 Table 2: col2 Timestamp -------------------- 01-mar-2012 11:12:10 01-mar-2012 11:11:23 Write a query to display a row with table2 col2 value less than tabl1 col1 value. Maximum timestamp value previous to table1 col1 value. Display a result as: Col1 col2 ----- ----- 01-mar-2012 11:12:46 01-mar-2012 11:12:10

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