Can you use select in FROM clause of SQL select ?

Can you use select in FROM clause of SQL select ?
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1 Answer

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Yes.
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Select ‘NORTH’, CUSTOMER From CUST_DTLS Where REGION = ‘N’ Order By CUSTOMER Union Select ‘EAST’, CUSTOMER From CUST_DTLS Where REGION = ‘E’ Order By CUSTOMER The above is a) Not an error b) Error - the string in single quotes ‘NORTH’ and ‘SOUTH’ c) Error - the string should be in double quotes d) Error - ORDER BY clause

Description : Select NORTH', CUSTOMER From CUST_DTLS Where REGION = N' Order By CUSTOMER Union Select EAST', CUSTOMER From CUST_DTLS Where REGION = E' Order By CUSTOMER The above is a) Not an error b) Error - ... ' and SOUTH' c) Error - the string should be in double quotes d) Error - ORDER BY clause

Last Answer : d) Error - ORDER BY clause

Can you use select in FROM clause of SQL select ?

Description : Can you use select in FROM clause of SQL select ?

Last Answer : Yes.

maxvalue.sql Select the Nth Highest value from a table?

Description : maxvalue.sql Select the Nth Highest value from a table?

Last Answer : select level, max('col_name') from my_table where level = '&n' connect by prior ('col_name') > 'col_name') group by level; Example: Given a table called emp with the following columns: -- id number -- name ... , max(sal) from emp -- where level=2 -- connect by prior sal > sal -- group by level

minvalue.sql Select the Nth lowest value from a table?

Description : minvalue.sql Select the Nth lowest value from a table?

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Description : How many LONG columns are allowed in a table ? Is it possible to use LONG columns in WHERE clause or ORDER BY ?

Last Answer : Only one LONG columns is allowed. It is not possible to use LONG column in WHERE or ORDER BY clause.

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Description : When do you use WHERE clause and when do you use HAVING clause?

Last Answer : HAVING clause is used when you want to specify a condition for a group function and it is written after GROUP BY clause. The WHERE clause is used when you want to specify a condition for columns, single row functions except group functions and it is written before GROUP BY clause if it is used.

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Description : Which parameter specified in the DEFAULT STORAGE clause of CREATE TABLESPACE cannot be altered after creating the tablespace?

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Description : What WHERE CURRENT OF clause does in a cursor?

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Description : What is a property clause?

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Description : Can a property clause itself be based on a property clause?

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Last Answer : (B) Rename operation.

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Last Answer : WRAP

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Last Answer : Data Definition Language : CREATE,ALTER,DROP,TRUNCATE,REVOKE,NO AUDIT & COMMIT.

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Description : What is the basic structure of PL/SQL ?

Last Answer : PL/SQL uses block structure as its basic structure. Anonymous blocks or nested blocks can be used in PL/SQL.

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Description : What are the datatypes a available in PL/SQL ?

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Description : You have just compiled a PL/SQL package but got errors, how would you view the errors?

Last Answer : SHOW ERRORS

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Description : Is it possible to insert comments into sql statements return in the data model editor?

Last Answer : Yes

How many types of Sql Statements are there in Oracle

Description : How many types of Sql Statements are there in Oracle

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Description : How you were passing cursor variables in PL/SQL 2.2?

Last Answer : In PL/SQL 2.2 cursor variables cannot be declared in a package.This is because the storage for a cursor variable has to be allocated using Pro*C or OCI with version 2.2, the only means of passing a cursor variable to a PL/SQL block is via bind variable or a procedure parameter.

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Last Answer : No, a cursor variable points a row which cannot be stored in a two- dimensional PL/SQL table.

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Description : What are various constraints used in SQL?

Last Answer : NULL -NOT NULL -CHECK -DEFAULT

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Last Answer : SQL*PLUS is a command line tool where as SQL and PL/SQL language interface and reporting tool. Its a command line tool that allows user to type SQL commands to be executed directly against an Oracle ... SQL*PLUS commands are used to format query result, Set options, Edit SQL commands and PL/SQL.

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Description : Explain how procedures and functions are called in a PL/SQL block ?

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Description : Question What is PL/SQL ?

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Description : What is an SQL *FORMS ?

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Last Answer : At the client.

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Description : What are the sql clauses supported in the link property sheet?

Last Answer : Where start with having.

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Description : What are the factors causing the reparsing of SQL statements in SGA?

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Description : What is a SQL * NET?

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Define SQL and state the differences between SQL and other conventional programming Languages

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Description : ……………… clause is an additional filter that is applied to the result. A) Select B) Group-by C) Having D) Order by

Last Answer : C) Having