MySQL 8.0.32如期而至 - IT评测·应用市场-qidao123.com技术社区

mysql> create table $t1(id int primary key);
Query OK, 0 rows affected, 1 warning (0.02 sec)
mysql> show warnings;
+---------+------+-------------------------------------------------------------------------------------------------------------+
| Level | Code | Message |
+---------+------+-------------------------------------------------------------------------------------------------------------+
| Warning | 1681 | '$ as the first character of an unquoted identifier' is deprecated and will be removed in a future release. |
+---------+------+-------------------------------------------------------------------------------------------------------------+
mysql> table $t1;
+----+
| id |
+----+
| 1 |
| 2 |
+----+
2 rows in set, 1 warning (0.00 sec)
mysql> show warnings;
+---------+------+-------------------------------------------------------------------------------------------------------------+
| Level | Code | Message |
+---------+------+-------------------------------------------------------------------------------------------------------------+
| Warning | 1681 | '$ as the first character of an unquoted identifier' is deprecated and will be removed in a future release. |
+---------+------+-------------------------------------------------------------------------------------------------------------+
mysql> table `$t1`; -- 加上反引号 "`" 就不再报告WARN
+----+
| id |
+----+
| 1 |
| 2 |
+----+
2 rows in set (0.00 sec)

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$ /usr/local/mysql-8.0.32-linux-glibc2.17-x86_64-minimal/bin/mysqldump --set-gtid-purged=OFF -S./mysql.sock --compress test > test.sql
WARNING: --compress is deprecated and will be removed in a future version. Use --compression-algorithms instead.
$ /usr/local/mysql-8.0.32-linux-glibc2.17-x86_64-minimal/bin/mysql --compress -S./mysql.sock
WARNING: --compress is deprecated and will be removed in a future version. Use --compression-algorithms instead.

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mysql> set @@explain_format = json;
Query OK, 0 rows affected (0.00 sec)
mysql> explain analyze select * from t1;
ERROR 1235 (42000): This version of MySQL doesn't yet support 'EXPLAIN ANALYZE with JSON format'

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mysql> explain format=tree select * from t1;
...
mysql> explain format=json select * from t1;
...
mysql> explain format=traditional select * from t1;
...
mysql> explain format=default select * from t1;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'default select * from t1' at line 1

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