• Oracle Sql Case Insensitive String Comparison

The danger is, if the string can be over 30 bytes, it will get silently truncated and you will likely get incorrect results from this predicate. Even if you want a case-sensitive comparison, binary collations are not case-sensitive (another very common misconception). No, LIKE is not always case-sensitive. Is SQL syntax case sensitive? How to concatenate text from multiple rows into a single text string in SQL server? How do I UPDATE from a SELECT in SQL Server? How to query MongoDB with “like”? How can I make SQL case sensitive string comparison on MySQL? Should URL be case sensitive?

This Access tutorial explains how to use Access StrComp Function to compare text, both case sensitive and case insensitive comparison.You may also want to read:Access StrComp Function to Compare text (case sensitive comparison)In Microsoft Excel, you cannot perform case sensitive comparison directly using equal sign. For example, if you type formula ='A'='a'The formula returns TRUE. Vlookup also shows matching result even though one is CAP and one is not.This case insensitive behavior is same in Microsoft Access.

Even if you use A and a as a key field to JOIN Table, the key field comparison is also case insensitive. To perform case sensitive comparison in Expression, use Access Function. For case sensitive Table Join, I will explain in.Syntax of Access StrComp Function StrComp ( string1, string2 , compare ) ArgumentDescriptionstring1Required. Any valid string expression.string2Required. Any valid string expression.compareOptional. Specifies the type of string comparison.

If the compareargument is Null, an error occurs. If compare is omitted, the Option Compare setting determines the type of comparison.ConstantValueDescriptionvbUseCompareOption-1Performs a comparison using the setting of the Option Compare statement.vbBinaryCompare0Performs a binary comparison.vbTextCompare1Performs a textual comparison.vbDatabaseCompare2Microsoft Office Access 2007 only. Performs a comparison based on information in your database.Access StrComp Function is closely related to, which also uses the compare argument in the function.

Simply speaking, argument vbBinaryCompare allows case sensitive comparison, while vbTextCompare is case insensitive comparison.There are 4 types of returned value-1: string1 string20: string1 = string21: string 1 string2(b) in binaryStrComp(“b”,”a”,1)1string1 (b) string2StrComp(“a”,”b”,0)-1string1 (a) string2(b) in binaryStrComp(“b”,”a”,0)1string1 (b).

.% matches one“%” character. matches one“ ” character.mysql SELECT 'David!' LIKE 'David';- 0mysql SELECT 'David' LIKE 'David';- 1To specify a different escape character, use theESCAPE clause:mysql SELECT 'David' LIKE 'David ' ESCAPE ' ';- 1The escape sequence should be empty or one character long.The expression must evaluate as a constant at executiontime.

As of MySQL 5.0.16, if theSQLmode is enabled, the sequence cannot be empty.The following two statements illustrate that stringcomparisons are not case sensitive unless one of theoperands is a case sensitive (uses a case-sensitivecollation or is a binary string):mysql SELECT 'abc' LIKE 'ABC';- 1mysql SELECT 'abc' LIKE latin1 'ABC' COLLATE latin1generalcs;- 0mysql SELECT 'abc' LIKE latin1 'ABC' COLLATE latin1bin;- 0mysql SELECT 'abc' LIKE BINARY 'ABC';- 0As an extension to standard SQL, MySQL permitson numeric expressions.mysql SELECT 10 LIKE '1%';- 1. NoteBecause MySQL uses C escape syntax in strings (forexample, “ n” to representa newline character), you must double any“ ” that you use instrings.

Oracle Sql Case Insensitive String Comparison

For example, tosearch for “ n”, specifyit as “ n”. To search for“ ”, specify it as“ ”; this is becausethe backslashes are stripped once by the parser and againwhen the pattern match is made, leaving a single backslashto be matched against.Exception: At the end of the pattern string, backslash canbe specified as “ ”. Atthe end of the string, backslash stands for itself becausethere is nothing following to escape. NoteAggregate queries involving comparisons with columns containingNULL may yield unexpected results. Forexample, consider the following table and data:CREATE TABLE foo (bar VARCHAR(10));INSERT INTO foo VALUES (NULL), (NULL);The query SELECT COUNT(.) FROM foo WHERE bar LIKE'%baz%'; returns 0.

You mightassume that SELECT COUNT(.) FROM foo WHERE barNOT LIKE '%baz%'; would return2. However, this is not the case: Thesecond query returns 0.

This is becauseNULL NOT LIKEexpr always returnsNULL, regardless of the value ofexpr. The same is true foraggregate queries involving NULL andcomparisons usingor.