mysql> SELECT i FROM t INNER JOIN t AS t2; ERROR 1052 (23000): Column 'i' in field list is ambiguous mysql> SELECT * FROM t LEFT JOIN t AS t2 ON i = i; ERROR 1052 (23000): Column 'i' in on clause is ambiguous 解析度: 用适当的表名限定列: mysql> SELECT t2.i FROM t INN...
The ssl option in the connection options takes a string or an object. When given a string, it uses one of the predefined SSL profiles included. The following profiles are included: "Amazon RDS": this profile is for connecting to an Amazon RDS server and contains the certificates from https...
Multiple instances of this option are additive. For more information, see mysqlpump Object Selection. --exclude-users=user_list Command-Line Format --exclude-users=user_list Type String Do not dump the user accounts in user_list, which is a list of one or more comma-separated account ...
For a VARCHAR, this often involved adding more spaces than there were characters in the original string. The string libraries were not optimized for this space padding, which added considerable overhead in some use cases. The padding semantics varied between character sets, some of which were...
SETPASSWORD[FORuser]='auth_string'[REPLACE'current_auth_string'][RETAINCURRENTPASSWORD] 参考文档:WL#11540: Support 2 active passwords per user account Partial Revoker 在之前如果你有create user权限,相应的也有了drop/create/modify任何账户的权限,包括root账户。如果用户有delete/update权限的话,甚至还可以修...
This is not the same as escaping '%' to '\%' or '_' to '\%' when using a LIKE query (example in db_exists), as this escape is there to avoid having _ or % characters interpreted in LIKE queries. The string parted of the first query could become (still used with args ...
# # The "notify-keyspace-events" takes as argument a string that is composed # of zero or multiple characters. The empty string means that notifications # are disabled. # # Example: to enable list and generic events, from the point of view of the # event name, use: # # notify-keyspa...
In debug builds, an assertion could occur in OPT_CHECK_ORDER_BY when using binary directly in a search string, as binary might include NULL bytes and other non-meaningful characters. (Bug #16766016) For some statements, memory leaks could result when the optimizer removed unneeded subquery claus...
For date and time types other thanTIMESTAMP, the default is the appropriate zero value for the type. For the firstTIMESTAMPcolumn in a table, the default value is the current date and time. SeeSection 6.2.2. For string types other thanENUM, the default value is the empty string. ForENU...
Now, hex-encoding is used only for string types having a binary character set. Strings with non-binary character sets are now printed in EXPLAIN FORMAT=TREE output as plain text, with escaping for any special characters. (Bug #33343948) For some functions, the resolved character set was not...