MySQL concat里面单引号的使用
通过concat拼字符串的时候，如果语句里面需要使用单引号，可以使用两个单引号来代替一个引号
mysql> select concat('drop user ''''@', '''', @@hostname, '''');
+----------------------------------------------------+
| concat('drop user ''''@', '''', @@hostname, '''') |
+----------------------------------------------------+
| drop user ''@'bei-f0q5bc2.gemalto.com' |
+----------------------------------------------------+
1 row in set (0.00 sec)
mysql> select concat('drop user ''''@', '''', @@hostname, '''');
+----------------------------------------------------+
| concat('drop user ''''@', '''', @@hostname, '''') |
+----------------------------------------------------+
| drop user ''@'bei-f0q5bc2.gemalto.com' |
+----------------------------------------------------+
1 row in set (0.00 sec)
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/26506993/viewspace-2134613/ ，如需转载，请注明出处，否则将追究法律责任。
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