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a string The PostgreSQL functions can be divided into groups based on the data types they handle: String functions Date and time functions Math functions Data conversion functions Aggregate functions The following sections describe each of these groups of functions and show a few basic examples of how to use the different types of functions
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Along with the standard string comparison operators discussed earlier, PostgreSQL provides a wealth of functions that can be used to manipulate string values The ANSI SQL standard specifies some standard string functions that all database vendors must implement to be ANSI standard Table 8-5 lists and describes the ANSI SQL string functions The upper() and lower() functions are commonly used to convert strings to all one case:
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test=> select upper("LastName"), lower("FirstName") from store"Customer"; upper | lower + BLUM | jessica BLUM | rich BLUM | barbara BLUM | katie MULLEN | (5 rows) test=>
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Notice that by default the column names in the result set change to the function name used (upper and lower), and not the table column name of the data used in the function (LastName and FirstName) Besides the standard ANSI SQL string functions, PostgreSQL provides some of its own string functions, listed and described in Table 8-6 Using string functions within SQL commands is fairly simple Just provide the required number of parameters for the function You should also be careful of what the function returns Some functions return the result as a string, and some return the result as an integer value Remember that an expression within a WHERE clause must compute
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String Function bit_length(string) char_length(string) Convert(string using encoding) lower(string) octet_length(string) Overlay(string1 placing string2 from int1 [for int2]) Position(string1 in string2)
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Description Return the number of bits in string Return the number of characters in string Convert the string encoding to another encoding Convert the string characters to lowercase Return the number of bytes in string Replace the string1 elements with string2, starting at position int1 to position int2 Return the location of substring string1 within string string2
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Substring(string [from int1] [for int2]) Extract a substring from string, starting at position int1 to position int2 By default, it starts at position 0 Substring(string from pattern) Substring(string from pattern for escape) trim([leading | trailing | both] [characters] from string) upper(string) Extract a substring from string matching the regular expression pattern Extract a substring from string matching the regular expression pattern using escape character escape Remove the leading, trailing, or both characters from string Default character is a space Convert the string characters to uppercase
Table 8-5 PostgreSQL ANSI SQL String Functions
to a Boolean TRUE/FALSE result, so you cannot use string functions by themselves within a WHERE clause You can however use them within the expression:
test=> select "FirstName", ascii("FirstName") from store"Customer" test-> where ascii("FirstName") = 74; FirstName | ascii + Jessica | 74 (1 row) test=>
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PostgreSQL String Function ascii(string) btrim(string [, characters]) chr(int) decode(string, encoding) encode(string, encoding) initcap(string) length(string) lpad(string, length [, fill])
Description Return the ASCII value of the first character of string Remove characters (or a space by default) from the start and end of string Convert the value int to the corresponding ASCII character value Convert binary data in string using the encoding type of base64, hex, or escape sequences Convert string to binary data using the encoding type of base64, hex, or escape sequences Convert the first character of string to uppercase Return the number of characters in string Make string length characters long by adding fill character to the beginning of the string (uses a space by default) Remove characters found in characterlist (the default is a space) from the beginning (left side) of string Calculate the MD5 hash of string The result is in hexadecimal format Used for generating passwords Convert string to a quoted string for use as a column identifier Convert string to a quoted string for use as a string literal value Return a string containing string repeated int number of times Replace all occurrences of outstring with instring within string Make string length characters long by adding fill character to the end (right side) of the string (uses space by default)
ltrim(string [, characterlist])
md5(string)
quote_ident(string) quote_literal(string) repeat(string, int) Replace(string, outstring, instring) rpad(string, length [, fill])
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