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The basic conventions are Each statement begins with a command, usually in the form of a single word, which is almost always an action verb. In this example, the statement starts with the SELECT command, which is described in detail in 4. Each statement ends with a delimiter, which is usually a semicolon (;). Some implementations allow the delimiter to be changed to some other character. Moreover, some implementations such as Oracle s will not execute an SQL statement that is missing the ending delimiter, while other implementations consider the ending delimiter optional. Statements are formed in a similar manner to English sentences, with one or more spaces used to separate language elements. A language element, similar to a word in an English sentence, is any keyword (SELECT, FROM, WHERE), database object name (MOVIE, MOVIE_ID, MOVIE_TITLE), operator (=), or constant ( PG ) that may appear in a statement. Statements are written in a free-form style, which means there are no strict rules about the position of language elements on a line or where a statement may be broken to a new line. However, it is generally not a good idea to split any single language element across multiple lines. This statement is logically identical to the one shown at the beginning of this topic, but isn t as easy to read and understand:

has an INT data type, and the AGENT_NAME column, which has a CHAR(60) data type. What SQL statement should you use

Table 3-6.

4. What are the three types of data types that SQL supports 5. What are the four types of string data types

SELECT MOVIE_ID,MOVIE_NAME FROM MOVIE WHERE MPAA_RATING_CODE='PG';

3:

7. What are the precision and the scale of the number 5293.472 8. What are the differences between exact numeric data types and approximate numeric

9. Which data types are exact numeric data types A DOUBLE PRECISION B DECIMAL C REAL D SMALLINT 10. A(n) ____________ data type specifies the year, month, and day values of a date. 11. What are the two types of interval data types that SQL supports 12. Which data type should you use to support a true/false construct that can be used for

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column and the CUSTOMER_CITY column. Both columns have a VARCHAR(60) data type. The CUSTOMER_CITY column also has a default value of Seattle. Which SQL statement should you use

Statements are organized into a series of clauses, and usually clauses must appear in a particular sequence when they are present (many clauses are optional). In our example, there are three clauses, each beginning with a keyword (SELECT, FROM, WHERE). SQL language elements may be written in upper- or lowercase or mixed case. However, in most implementations, and per the ANSI/ISO standards, all lowercase characters are automatically shifted to uppercase for processing. This is not to say that data can never be in lowercase but rather that commands and database object names (tables, columns, etc.) must be in uppercase. Notable exceptions are Microsoft SQL Server and Sybase, both of which allow the database to operate in case-sensitive mode wherein object names written in different cases are treated as different names. In MySQL, object name case sensitivity is tied to whether or not the underlying operating system has case-sensitive names or not.

15. Which SQL statement should you use to delete a column from an existing table 16. Which SQL statement should you use to delete a table definition and all its SQL data from

Figure 3-33.

named NATIONALITY to the table. The column should have a VARCHAR(40) data type. What SQL statement should you use

Commas are used to separate items in a list. In our example, two column names were provided in a comma-separated list (MOVIE_ID, MOVIE_ TITLE). Spaces following each comma are completely optional you can include no spaces, or as many as you want. Character strings that appear in SQL statements must be enclosed in single quotes (some SQL implementations also allow double quotes). Numeric constants are never enclosed in quotes. If a quote needs to appear within the character string, two single quotes next to each other take care of it. For example, if you wanted to nd the movie Sophie s Choice in the database, you would write the WHERE clause like this:

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