98-364 Creating Database Objects
A char string can be up to _______ characters long.
8,000 Explanation: For the data set char, it is identified as char [(n)] and is a fixed-length, non-Unicode character (in other words, regular character) and has a length of n bytes. The value of n must be between 1 and 8,000 bytes. The other non-Unicode data type, varchar[(n|max)], is a variable-length data set, which can consist of 1 to 8,000 characters.
What does VARCHAR(25) represent?
A character string up to 25 characters long Explanation: When you use a VAR element, SQL Server preserves space in the row it resides in based on the column's defined size and not on the actual number of characters found in the character string itself, plus an extra 2 bytes of data are provided for offset data. For example, if you want to specify that a strong supports only a maximum of 25 characters, you would use VARCHAR(25).
What two commands will perform implicit conversion?
Cast and Convert. Cast and convert play an integral partnership with any data type function as they convert an expression of one data type to another. convert was the old style of converting, with cast being used in the same manner.
How many bytes does a single character take up if it is a varchar that supports English and most European languages? a) 1 byte b) 2 bytes c) 4 bytes d) 8 bytes
a) 1 byte Explanation: A regular character uses 1 byte of storage for each character, which allows you to define one of 256 (8 bits are in a byte and 2^8=256) possible characters that accommodate English and some European languages.
Which naming conversion would capitalize the first character of each word with no spaces? a) PascalCase b) camelCase c) CapCase d) FirstCase
a) PascalCase Explanation: It really doesn't make a difference how you use upper- and lowercase, as long as you are consistent. Two common naming conventions are PascalCase and camelCase. Examples of PascalCase include such names as OrderDetails or CustomerAddresses.
What type of conversion occurs without specifying the actual callout function? a) implicit b) explicit c) casting d) autocasting
a) implicit Explanation: SQL Server supports implicit conversions, which can occur without specifying the actual callout function (cast or convert). This means that if you are doing calculations with multiple data types, implicit conversion will occur automatically.
What data type should you use to support Japanese or Arabic text? a) nvarchar b) char c) Unicode d) varchar
a) nvarchar Explanation: The Unicode character strings nchar and nvarchar can be either fixed or variable like their regular character strings. They use the Unicode UCS-2 character set.
Which attribute specifies the type of data that an object can hold and specifies how many bytes it will take up? a) specifier b) data type c) validator d) data specific
b) data type Explanation: A data type is an attribute that specifies the type of data that an object can hold. It also specifies how many bytes each data type takes up. For example, several data types define only whole numbers, which are good for counting or for identification. Other data types allow decimal numbers and come in handy when storing values dealing with money. Other data types are designed to store strings or multiple characters so that you can define labels, descriptions, and comments. Lastly, you have other miscellaneous data types that can store dates, times, and binary numbers consisting of 0s and 1s or can be used to store digital images.
What common data type you would be used to count objects? a) money b) integer c) float d) double float
b) integer Explanation: The int numeric data type is used to store mathematical computations and is used when you do not require a decimal point output. An example of an integer would be: 2 or -2
What is a virtual table consisting of different columns from one or more tables? a) index b) view c) vtable d) vlookup
b) view Explanation: A view is simply a virtual table consisting of different columns from one or more tables. Unlike a table, a view is stored in the database as a query object; therefore, a view is an object that obtains its data from one or more tables.
How many bytes does the int data type take up? a) 1 byte b) 2 byte c) 4 byte d) 8 byte
c) 4 byte Explanation: The int data type holds integer data from -2^31(-2,147,483,648) to 2^31-1(2,147,483,647). It takes 4 bytes of data.
What type of data type would you use to store true/false or yes/no answers? a) int b) char c) Boolean d) float
c) Boolean Explanation: Boolean is also known as a bit data type. If you are storing 8 or less bit columns in a table, the columns are then stored as 1 byte; if you are storing 9 to 16 bits, the columns are stored as 2 bytes, and so forth. The Boolean data type converts true and false string values to bit values, with true converted to 1 and false converted to 0.
What is a type of attack in which malicious code is inserted into strings that are passed to the SQL server instance? a) SQL infection b) SQL takeover c) SQL injection d) SQL force
c) SQL injection Explanation: A SQL injection is an attack in which malicious code is inserted into strings that are later passed to instances of SQL Server waiting for parsing and execution. Any procedure that constructs SQL statements should be reviewed continually for injection vulnerabilities, because SQL Server will execute all syntactically valid queries from any source.
What kind of character takes up two bytes of storage and can include almost any language including Chinese, Japanese, and Arabic? a) standard b) ANSI c) Unicode d) Duocode
c) Unicode Explanation: A Unicode character uses 2 bytes of storage per character so that you can represent one of 65,536 (16 bits are in a 2 bytes and 2^16=65,536 characters). The additional character allows it to store characters from just about any language, including Chinese, Japanese, Arabic, and so on.
What common data type is used to store decimal numbers such as 3.14 and 7.07? a) money b) integer c) float d) varchar
c) float Explanation: A float numeric data type is commonly used in the scientific community and is considered an approximate-number data type. This means that not all values within the data type range will be represented exactly. When considering using this numeric data type, note that thefloat data type ranges are different. For storage of 4 bytes, you would use the range of 1-24, as in float(24), and for 8 bytes, you would use the range of 25-53, as in float(53).
How many bytes does the money data type take up? a) 1 byte b) 2 byte c) 4 byte d) 8 byte
d) 8 byte Explanation: The money data type holds currency values from -922,337,203,685,477.508 to 922,337,203,685,477.5807. It takes 8 bytes of data.
What is the set of rules that determine how data is sorted and compared? a) sort rule b) filter c) constraint d) collation
d) collation Explanation: Collation refers to a set of rules that determine how data is sorted and compared. By default, SQL Server has predefined collation precedence. If you want to override how data is sorted, you must use a collation clause.
What command is used to execute a stored procedure? a) go b) use c) start d) exec
d) exec Explanation: An example of executing a stored procedure is as follows: exec usp_displayallusers The name of the stored procedure is usp_displayallusers, and exec tells SQL Server to execute the code in the usp_displayallusers stored procedure.
What are previously written SQL statements that have been stored within a database? a) data statements b) views c) DDL statements d) stored procedures
d) stored procedures Explanation: A stored procedure is a previously written SQL statement that has been "stored" or saved into the database. Creating a stored procedure will save you time when running the same query over and over again; you can then execute the stored procedure from within the database's command environment.
Which data type should you use to store text based on English? a) text b) int c) float d) varchar
d) varchar Explanation: A varchar character string data type is commonly used in databases in which you are supporting English attributes. If you are supporting multiple languages, use the nvarchar data type instead because this will help minimize the issues that come with character conversion.
