what is an alias command? : Sql dba

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What is the basic difference between a sql and stored procedure ?

2 Answers   L&T,

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what is transaction? : Sql dba

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Explain the concept of normalization.

3 Answers  

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What is the difference between jpql and sql?

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What are the advantages of sql?

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What is a constraint? Tell me about its various levels.

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how can we replace the particular column value of a resulted set of executed query? I mean write down a sql query to chane the particular column's value of a resulted set of executed query

3 Answers  

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How will you make performance better for application including front end and back

2 Answers   Metric Stream,

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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 Answers  

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how to convert character strings to numeric values? : Sql dba

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wtite down triggr not any entry on Sunday

2 Answers   NIT,

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