sql single quote

Sequential execution of MULTIPLE commands; sequential execution of multiple commands logic with previous command execution OK, followed by|| logical OR previous command execution failed after execution| Command 1| Command 2 command 1 result, let the command handleWildcard characters？ match any one character* match 0 or more of any characters[] matches any one of the characters in brackets[-] match any one of the characters in parentheses[^] logical non-match is not one of the characters in brack

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use it in a stringDouble quotes, it needs to be escaped, just like the escaped meaning in a language such as Javascript,c, in VBScript,Double quotesThe escape method is to write twoDouble quotes, i.e. "", such as Response.Write "I say" "You is so clever!" "" The result of the output is: I say "You is so clever!" There are two purposes for using escape: 1, of course, it is necessary to useDouble quotesThe place must be usedDouble quotes2, when the output of HTML code is not recommended, the att

Reference symbols protect special metacharacters and parameter extensions in the parser using 3 ways: backslash (\), single quotation mark ('), double quotation mark ("").Single and double quotes must be matched to protect special metacharacters and wildcards in the parser, but single quotation marks (hard escapes) are used primarily for the original output of in

Reference symbols protect special metacharacters and parameter extensions in the parser using 3 ways: backslash (\), single quotation mark ('), double quotation mark ("").Single and double quotes must be matched to protect special metacharacters and wildcards in the parser, but single quotation marks (hard escapes) are used primarily for the original output of in

(1) What is the difference between single and double quotation marks?1, can be used to escape the range, the single quotation mark can only escape the single quotation mark \ ', double quotation marks except single quotation mark cannot escape, other \ "\n\r\t can.2, double quotation mark can parse PHP variable,

1. Numeric type index is not added.2. The index of the string type must be added, plus the single quotation mark.According to the followingIn general, but when the index is a number, if passed $arr[' 1 '] will first convert 1 to a number, which will affect the efficiencyIf the string is not quoted, if there is a constant and index value equal at this point, the index is converted to a constant value. such as defined ("name", "Zhangsan") $arr [name]---

character preceded by backslash, including single quote, double quote, backslash PHP Tutorial code function D_addslashes ($string, $force = 0) { if (! $globals [' MAGIC_QUOTES_GPC '] | | $force) { if (Is_array ($string)) { foreach ($string as $key = + $val) $string [$key] = D_addslashes ($val, $force); } else $string = addslashes ($string); } return $s

1. Both single and double quote usages are the same, but if you have the same characters in a string, you use \ to escapeExample:1) print ' Hello '2) print "Hello"1 and 2, and the result is hello.3) print ' hell\ ' o '4) print "Hell ' o"3 and 4, the result is Hell ' O5) print ' Hell ' o '6) print "Hell\" O "5 and 6, the result is Hell "O2. Three quotation marks differ from them: "WYSIWYG", which is more int

(1) What is the difference between single and double quotation marks? 1, can be used to escape the range, the single quotation mark can only escape the single quotation mark \ ', double quotation marks except single quotation mark cannot escape, other \ "\n\r\t can. 2, double quotation mark can parse PHP variable,

Today in the online crawler, it is strange to find that Python string can be used both double quotation marks and single quotation marks, so on the internet Baidu for a reason.It turns out that there may be both double and single quotes in the string, for example:String: Demo ' 1 '.At this point, you can: str = "Demo ' 1 '"; This is more intuitive, and of course you can use the escape character \ ' instead