how many tupples can insert in 1 second in sql

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Can we use rowid as primary key?

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What is the main difference between a UNION statement and a UNION ALL statement? 1. A UNION statement eliminates duplicate rows; a UNION ALL statement includes duplicate rows. 2. A UNION statement can be used to combine any number of queries; a UNION ALL statement can be used to combine a maximum of two queries. 3. A UNION statement can only combine queries that have parallel fields in the SELECT list; a UNION ALL statement can combine queries with differing SELECT list structures. 4. A UNION statement cannot be used with aggregate functions; a UNION ALL statement can be used with aggregate functions. 5. There is no difference between the two statements; they are interchangeable.

2 Answers   Saman Bank, Sonata,

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what is a trigger in mysql? Define different types of trigger. : Sql dba

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What is sql injection vulnerability?

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Explain ddl statements in pl/sql?

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In a distributed database system, can we execute two queries simultaneously?

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what is meant by urlencode and urldocode? : Sql dba

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What is not equal in sql?

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what is myisam? : Sql dba

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3. Select sum(a) sum_1,max(a) max_1 ,count(a) count_1 from ( ( select 1 a from dual union all Select to_number(‘2011’) a from dual union all select 1 a from dual) union select 2 b from dual);

1 Answers   Fintellix,

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How can you fetch common records from two tables?

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