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Categories >> Software >> Databases >> SQL PLSQL


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Other SQL PLSQL Interview Questions
  Question Asked @ Answers
write a query to remove null following table are id name 101 dinesh null jyothi null bharathi 102 suresh null shilpha 103 prakesh null suma i want the output format like id name 101 dinesh 102 suresh 103 prakesh TCS 3
what is the cursor and use of cursor in pl/sql ?   3
How to return more than one value from a function? Satyam 10
If we have n no of columns in a table, can we add new column in that table with not null constraint?   2
how to findout the 100th maximum salary AMDOC 24
What is Primary Key? Ramco 4
Write a query to get last 10 records from the table. iNautix 7
what is meant by DML? HCL 5
What is the difference between SQL and PLSQL IBM 4
SELECT emp_num, years, SUM(salary) FROM sales UNION ALL SELECT emp_id, SUM(takehomepay) FROM marketing What error is present in the sample code above? 1. Queries being combined with the UNION ALL statement are not allowed to have SELECT lists with a different number of expressions. 2. You are not allowed to use aggregate functions within two queries joined by a UNION ALL statement. 3. The UNION ALL statement incorrectly combines the "years" result from the first query with the "SUM (takehomepay)" result from the second query. 4. Unless the UNION ALL statement is replaced with a UNION statement, the queries will return duplicates. 5. The "emp_id" column from the second query must be renamed (or aliased) as "emp_num" so that it corresponds to the column name from the first query. Otherwise, the queries will not execute.   3
write the Sql query for creating database backup? TCS 7
If a View on a single base table is manipulated will the changes be reflected on the base table?   5
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