mysql quote

There may be some small details in the daily write SQL that cause the overall SQL performance to degrade several times or even dozens of times times, hundreds of times times. The following example is the performance loss caused by a single quotation

Reprint Address: http://blog.itechol.com/space.php?uid=33&do=blog&id=66811, in the MySQL statement "'" function: To avoid the indication, the field name and MySQL existing "reserved word" conflict, causing an unknown error.2, so we build tables and

(ext.) The effect of anti-quotation marks when MySQL creates a tableWhen you try the Navicat tool to view the current MySQL build table statement, it is found that the table name and field names are quoted in reverse quotation marks. 123

When you try the Navicat tool to view the current MySQL build table statement, it is found that the table name and field names are quoted in reverse quotation marks.CREATE TABLE ' Tab_notice_title_tv ' ( ' i_id ' int (one) not NULL auto_increment,

String function string comparison function if the result length is greater than the maximum value of the max_allowed_packet system variable, the return value of the string value function is NULL. See section 7.5.2 "Adjust server Parameters ". String

Generally, the entire string is used as the operation object, for example: search for a substring in a substring, obtain a substring, insert a substring at a certain position in the substring, and delete a substring. Generally, the entire string is

String functionsstring comparison functionsIf the length of the result is greater than the maximum value of the Max_allowed_packet system variable, the return value of the string value function is null. See section 7.5.2, "Tuning server parameters."

Generally, the entire string is used as the operation object, for example: search for a substring in a substring, obtain a substring, insert a substring at a certain position in the substring, and delete a substring. The required and sufficient

First meeting1. Initial knowledgehttp://localhost/Less-1/Prompt for ID, so access http://localhost/Less-1/?id=1Can continue to test the situation of id=2.3.4, etc., will output a different user name and password2. Further informationEach time will

1, in MySQL, the reserved word can not be used as table name, field name, etc., as follows:Mysql> ALTER TABLE student ADD column desc varchar (+) after name;1064-you has an error in your SQL syntax; Check the manual-corresponds to your MySQL server