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OCA/OCP Oracle Database 11g All-in-One Exam Guide
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dot com The SUBSTR function may be used to extract this value However, the start position and the length are still unknown The INSTR function may be used to locate the position of the first occurrence of the @ symbol and the characters com 3 A possible solution is
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select distinct substr(email, instr(email,'@')+1, instr(email, 'com')) hostname from customers;
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SQL conversion functions are single-row functions designed to alter the nature of the data type of a column value, expression, or literal TO_CHAR, TO_NUMBER, and TO_ DATE are the three most widely used conversion functions TO_CHAR converts numeric and date information into characters, while TO_NUMBER and TO_DATE convert character data into numbers and dates, respectively
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Oracle allows columns to be defined with ANSI, DB2, and SQL/DS data types These are converted internally to Oracle data types Each column has an associated data type that constrains the nature of the data it can store A NUMBER column cannot store character information A DATE column cannot store random characters or numbers However, the character equivalents of both number and date information can be stored in a VARCHAR2 field If a function that accepts a character input parameter finds a number instead, Oracle automatically converts it into its character equivalent If a function that accepts a number or a date parameter encounters a character value, there are specific conditions under which automatic data type conversion occurs Although implicit data type conversions are available, it is generally more reliable to explicitly convert values from one data type to another using single-row conversion functions
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Values that do not share identical data types with function parameters are implicitly converted to the required format if possible VARCHAR2 and CHAR data types are collectively referred to as character types Character fields are flexible and allow the storage of almost any type of information Therefore, DATE and NUMBER values can easily be converted to their character equivalents These conversions are known as number to character and date to character conversions Consider the following queries: Query 1: select length(1234567890) from dual Query 2: select length(SYSDATE) from dual Both queries use the LENGTH function, which takes a character string parameter The number 1234567890 in query 1 is implicitly converted into a character string,
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10: Single-Row and Conversion Functions
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1234567890 , before being evaluated by the LENGTH function, which returns 10 Query 2 first evaluates the SYSDATE function, which is assumed to be 07-APR-38 This date is implicitly converted into the character string 07-APR-38 , and the LENGTH function returns the number 9 It is uncommon for character data to be implicitly converted into numeric data types, since the only condition under which this can occur is if the character data represents a valid number The character string 11 will be implicitly converted to a number, but 11123456 will not be, as the following queries demonstrate: Query 3: select Query 4: select Query 5: select Query 6: select mod('11', 2) from dual mod('11123', 2) from dual mod('11123456', 2) from dual mod('$11', 2) from dual
PART II
Queries 3 and 4 implicitly convert the character strings 11 and 11123 into the numbers 11 and 11123, respectively, before the MOD function evaluates them and returns the results 1 and 1123 Query 5 returns the error ORA-1722: invalid number, when Oracle tries to perform an implicit character to number conversion because the string 11123456 is not a valid number Query 6 also fails with the invalid number error, since the dollar symbol cannot be implicitly converted into a number Implicit character to date conversion is possible when the character string conforms to the following date patterns: [D|DD] separator1 [MON|MONTH] separator2 [R|RR|YY|YYYY] D and DD represent single-digit and two-digit days of the month MON is a three-character abbreviation, while MONTH is the full name for a month R and RR represent single- and two-digit years YY and YYYY represent two- and four-digit years, respectively The separator1 and separator2 elements may be most punctuation marks, spaces, and tabs Table 10-2 demonstrates implicit character to date conversion, listing several function calls and the results SQL Developer returns These results assume that your system makes use of the American session defaults
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