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Listing 5-9. Using the INSTR and substr Functions select , , , , , from dname substr(dname,4) substr(dname,4,3) instr(dname,'I') instr(dname,'I',5) instr(dname,'I',3,2) departments; as as as as as substr1 substr2 instr1 instr2 instr3
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DNAME ---------ACCOUNTING HR SALES TRAINING
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SUBSTR1 SUBSTR2 INSTR1 INSTR2 INSTR3 ------- ------- -------- -------- -------OUNTING OUN 8 8 0 0 0 0 ES ES 0 0 0 INING INI 4 6 6
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Listing 5-10. Using the ltrim and RTRIM Functions select , , from where ename ltrim(ename,'S') as ltrim_s rtrim(ename,'S') as rtrim_s employees deptno = 20; LTRIM_S -------ADAMS FORD JONES COTT MITH RTRIM_S -------ADAM FORD JONE SCOTT SMITH
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ENAME -------ADAMS FORD JONES SCOTT SMITH
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Listing 5-11 demonstrates using the LPAD and RPAD functions. Note that they not only lengthen strings, as their names suggest, but sometimes they also shorten strings; for example, see what happens with ACCOUNTING and TRAINING in Listing 5-11. Listing 5-11. Using the LPAD and RPAD Functions select , , from dname lpad(dname,9,'>') rpad(dname,6,'<') departments; LPAD(DNAM --------ACCOUNTIN >>>>>>>HR >>>>SALES >TRAINING RPAD(D -----ACCOUN HR<<<< SALES< TRAINI
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DNAME ---------ACCOUNTING HR SALES TRAINING
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RETRIEVAL: FUNCTIONS
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You can use the LPAD and RPAD functions to produce column-value histograms by providing variable expressions, instead of constant values, as their second argument. For an example, see Listing 5-12, which shows how to create a salary histogram with a granularity of 100. Listing 5-12. Producing Histograms with the LPAD and RPAD Functions select lpad(msal,4)||' '|| rpad('o',msal/100,'o') as histogram from employees where deptno = 30; HISTOGRAM ----------------------------------------------1600 oooooooooooooooo 1250 oooooooooooo 1250 oooooooooooo 2850 oooooooooooooooooooooooooooo 1500 ooooooooooooooo 800 oooooooo Listing 5-13 shows the difference between the functions REPLACE and TRANSLATE. TRANSLATE replaces individual characters. REPLACE offers the option to replace words with other words. Note also what happens if you use the REPLACE function with only two arguments, instead of three: the function removes words instead of replacing them. Listing 5-13. Using the TRANSLATE and REPLACE Functions select , , from translate('beer bucket','beer','milk') as translate replace ('beer bucket','beer','milk') as replace_1 replace ('beer bucket','beer') as replace_2 dual;
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TRANSLATE REPLACE_1 REPLACE_2 ----------- ----------- --------miik muckit milk bucket bucket
5.4 Regular Expressions
The previous chapter introduced the LIKE operator, and the previous section of this chapter introduced the INSTR, SUBSTR, and REPLACE functions. All of these SQL functions search for text. The LIKE operator offers the two wildcard characters % and _, which allow you to perform more advanced searches. The other three functions accept plain text searches only. This functionality is sometimes insufficient for complicated search operations. Therefore, Oracle SQL also supports four functions: REGEXP_LIKE, REGEXP_INSTR, REGEXP_SUBSTR, and REGEXP_REPLACE. These SQL functions support, as their names suggest, so-called regular expressions. Apart from that, they serve the same purpose as their non-REGEXP counterparts. Regular expressions are well known in all UNIX operating system variants (such as Linux, Solaris, and HP/UX) and are part of the international POSIX standard. They are documented in great detail in
RETRIEVAL: FUNCTIONS
Oracle SQL Reference, Appendix C. This section provides an introduction to regular expressions, focusing on their use with the Oracle SQL regular expression functions.
Regular Expression Operators and Metasymbols
Table 5-4 shows the most important regular expression metasymbols and their meanings. The Type column in Table 5-4 may contain the following: Postfix, which means that the operator follows its operand Prefix, which means that the operator precedes its operand Infix, which means that the operator separates its operands Nothing (empty), which means that the operator has no operands
Table 5-4. Common Regular Expression Operators and Metasymbols
Operator
* + | ^ $ . [[^]list]
Type
Postfix Postfix Postfix Infix Prefix Postfix ---
Description
Zero or more occurrences One or more occurrences Zero or one occurrence Operator to separate alternative choices Beginning of a string, or position immediately following a newline character End of the line Any single character One character out of a list; a circumflex (^) at the beginning works as a negation; a dash (-) between two characters works as a range indicator Groups a (sub)expression, allowing you to refer to it further down in the expression Precisely m times At least m times At least m times, and at most n times Refers back to the nth subexpression between parentheses (n is a digit between 1 and 9)
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