session.query(Account).filter(~Account.id.in_([1,3,5])) #查询工资不为2000,3000,4000的记录 session.query(Account).filter(~Account.salary.in_([2000,3000,4000])) #查询所有title不为Engineer和Accountant的记录 session.query(Account).filter(~Account.title.in_(['Account','Engineer'])) 1. 2....
Select f_price,f_name from fruits order by f_price desc,f_name;【先按f_price降序,再按f_name升序】 11. 分组查询 创建分组 Select s_id,count(*) as total from fruits group by s_id;【分组统计s_id的数量】 使用having过滤分组 Select s_id,group_concat(f_name) as names From fruits Groud...
MySQL [test2023]>insertintotest_autoincrement(name,uid)select'张三',1001; Query OK,1rowaffected (0.08sec) Records:1Duplicates:0Warnings:0MySQL [test2023]>insertintotest_autoincrement(name,uid)select'李四',1002; Query OK,1rowaffected (0.06sec) Records:1Duplicates:0Warnings:0MySQL [test2023]>M...
1:SQL模式的NO_AUTO_VALUE_ON_ZERO值影响AUTO_INCREMENT列的行为。 mysql>droptableifexiststest; Query OK, 0rowsaffected (0.01 sec) mysql>createtabletest(idintauto_incrementprimarykey, namevarchar(32)); Query OK, 0rowsaffected (0.02 sec) mysql>select@@sql_mode; +---+ | @@sql_mode | +--...
MySQL [test2023]> REPLACE INTO test_autoincrement (name,uid) values('张三丰',1001); Query OK, 2 rows affected (0.01 sec)这里通过REPLACE INTO操作判断,如果存在唯一ID为1001的记录,那么将name字段的值更改为"张三丰",可发现此时影响的行数是2。现在我们再次查看主从节点表的autoincrement值。
Learn to set up an auto increment primary key in SQL Servers, including table creation and the benefits of using identity for efficient database operations
sql_auto_is_null sql_select_limit timestamp tx_read_only version sql_warnings max_user_connections init_connect license net_buffer_length system_time_zone query_cache_size query_cache_type sql_quote_show_create sql_safe_updates ob_proxy_partition_hit ob_log_level ob_max_parallel_degree ob_qu...
此时出现了主从节点表的AUTO_INCREMENT不一致现象。 2.3.2 模拟主从切换 由于是在测试环境,这里就直接进行了主从关系的更改。 (1)停止当前slave节点的复制线程 复制 MySQL[test2023]>stop slave;QueryOK,0rows affected(0.08sec) 1. 2. (2)查看当前slave节点的Executed_Gtid_Set值 ...
query_cache_size query_cache_type read_only recyclebin resource_manager_plan secure_file_priv sql_auto_is_null sql_mode sql_quote_show_create sql_safe_updates sql_select_limit sql_throttle_current_priority sql_throttle_network sql_throttle_priority sql_throttle_rt sql_warnings system_time_zone ...
You may see gaps in the sequence of values assigned to the AUTO_INCREMENT column if you roll back transactions that have generated numbers using the counter. 大概意思是,Innodb存储引擎的auto_increment计数器是随着mysql-server启动分配,并永久缓存在内存中。当插入数据失败或者回滚事务时,内存中的auto_incr...