Tag: databases

To answer this question, you need to understand how statements are executed in SQL*Plus.

In SQL*Plus, a statement can be continued onto the next line by using the hyphen ("-") character. This is known as a line continuation character.

Option A) * - This character is not used to continue a statement in SQL*Plus. Option B) / - This character is used to execute a statement in SQL*Plus, but it is not used to continue a statement onto the next line. Option C) - This character is the correct answer. It is used to continue a statement onto the next line in SQL*Plus. Option D) @ - This character is used to run a script or a file in SQL*Plus, but it is not used to continue a statement onto the next line.

The correct answer is Option C) -. This character is used to continue a statement in SQL*Plus.

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To answer this question, you need to understand the SQL functions and their capabilities. Let's go through each option to understand why it is correct or incorrect:

Option A) TO_CHAR - This function is used to convert a number or date to a character string. It operates on specific datatypes like numbers and dates, so it cannot operate on any datatype. Therefore, Option A is incorrect.

Option B) LOWER - This function is used to convert a character string to lowercase. It operates on character strings and can be used with any datatype that can be implicitly converted to a character string. Therefore, Option B is incorrect.

Option C) LPAD - This function is used to pad a character string with a specified character to a specified length. It operates on character strings and can be used with any datatype that can be implicitly converted to a character string. Therefore, Option C is incorrect.

Option D) MAX - This function is used to return the maximum value in a column or a set of values. It can operate on any datatype, including numbers, characters, and dates. Therefore, Option D is correct.

The correct answer is D. This option is correct because the MAX function can operate on any datatype.

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To answer this question, you need to understand the syntax for inserting values into a table using the INSERT statement. Let's go through each option to understand why it is correct or incorrect:

Option A) INSERT INTO r4r_team (id, username, exp) VALUES (1, 'r4r01', '2') - This option is correct. It follows the correct syntax for inserting values into the r4r_team table. The column names (id, username, exp) are specified, followed by the keyword VALUES, and then the corresponding values (1, 'r4r01', '2').

Option B) INSERT INTO r4r_team VALUES (1, 'r4r01', '2') - This option is incorrect. While it inserts values into the r4r_team table, it does not specify the column names. It assumes that the values are being inserted in the order of the columns defined in the table, which can lead to errors if the order is different.

Option C) INSERT INTO r4r_team (id, username, exp) VALUE (1, 'r4r01', '2') - This option is incorrect. The correct keyword is VALUES, not VALUE. This is a syntax error.

Option D) INSERT INTO table r4r_team (id, username, exp) VALUE (1, 'r4r01', '2') - This option is incorrect. The correct syntax does not include the keyword "table" before the table name. Additionally, the correct keyword is VALUES, not VALUE.

The correct answer is A. This option is correct because it follows the correct syntax for inserting values into the r4r_team table, specifying the column names and corresponding values.

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• Wrong explanation