Per the SQL standard,LIKEperforms matching on a per-character basis, thus it can produce results different from the=comparison operator: mysql>SELECT'ä'LIKE'ae'COLLATElatin1_german2_ci;+---+|'ä' LIKE 'ae' COLLATE latin1_german2_ci|+---+|0|+---+mysql>SELECT'ä'='ae'COLLATE...
Per the SQL standard,LIKEperforms matching on a per-character basis, thus it can produce results different from the=comparison operator: mysql>SELECT'ä'LIKE'ae'COLLATElatin1_german2_ci;+---+|'ä' LIKE 'ae' COLLATE latin1_german2_ci|+---+|0|+---+mysql>SELECT'ä'='ae'COLLATE...
> in order to get my correct result, and UTF8 comparison treat é == è I suspect it's something to do with collation/ case-sensitivity. Can someone explain to me: 1) anything wrong with my understanding of UTF8? 2) the right way to store Chinese char into MySQL ...
If both arguments in a comparison operation are strings, they are compared as strings. If both arguments are integers, they are compared as integers. Hexadecimal values are treated as binary strings if not compared to a number. If one of the arguments is aTIMESTAMPorDATETIMEcolumn and the oth...
我们查看该表结构,发现xxno为varchar类型,但是等号右边是一个数值类型,这种情况下MySQL会如何进行处理呢?官方文档如下:https://dev.mysql.com/doc/refman/5.6/en/type-conversion.html The following rules describe how conversion occurs for comparison operations: ... 省略一万字 ... In all other cases, the...
The comparison seems to succeed because MONTHNAME(NOW()) becomes 1 (not 0) when converted to numeric form. mysql> SELECT NOW(), MONTHNAME(NOW()), 'January'; +---+---+---+ | NOW() | MONTHNAME(NOW()) | January | +---+---+---+ | 2008-01-09 09:14:11 | January | Janua...
MySQL starts to lack precision in string comparison for the sake of better performance. However, what sounds great in theory has an interesting impact on Web applications in many situations, and means the characterAwill be the same for MySQL in a string comparison as the characterÄ. The fol...
All MySQL collations are of type PAD SPACE. This means that all CHAR, VARCHAR, and TEXT values are compared without regard to any trailing spaces. “Comparison” in this context does not include the LIKE pattern-matching operator, for which trailing spaces are significant. For example: ...
Multiple String Comparison using LIKE and IN Multiple Tables with a CURSOR multiple transactions on the same table ? Multiple update statements within a Merge Statement Must declare the scalar variable "@StartDate" mysterious results using NULLS and UNION statements. Naming a Sub Query naming conventi...
2) Create DB connection-2 to table [test_utf_clean] SET NAMES utf8; 3) Loop every records from [test_utf] - dynamic generate "INSERT INTO test_utf_clean VALUES (...)" - execute the statement on connection-2 A quick fix, anyone with pure MySQL statements to do this (without PHP...