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skipping updates to other database in the update log. -p, --password[=name] Password to use when connecting to server. If password is not given it's asked from the tty. -W, --pipe Use named pipes to connect to server. -P, --port=# Port number to use for connection. --prompt=...
*/ SELECT game.mdate, game.team1, SUM(CASE WHEN goal.teamid=game.team1 THEN 1 ELSE 0 END) AS score1, game.team2, SUM(CASE WHEN goal.teamid=game.team2 THEN 1 ELSE 0 END) AS score2 FROM game LEFT JOIN goal ON (goal.matchid = game.id) GROUP BY game.mdate,game.team1,game...
从笛卡尔积的角度讲就是从笛卡尔积中挑出ON子句条件成立的记录,然后加上左表中剩余的记录,最后加上右表中剩余的记录。另外MySQL不支持OUTER JOIN,但是我们可以对左连接和右连接的结果做UNION操作来实现。连接后的筛选结果依然正常使用group by having等函数 七Case when...
1use数据库名; 我们要操作某一个数据库下的表时,就需要通过该指令,切换到对应的数据库下,否则是不能操作的。 2.3.2表操作 2.3.2.1 表操作-查询 1)查询当前数据库所有表 1show tables; 2)查看指定表结构 1desc表明; 通过这条指令,我们可以查看到指定表的字段,字段的类型、是否可以为NULL,是否存在默认值等...
--max-join-size=# Automatic limit for rows in a join when using --safe-updates. --secure-auth Refuse client connecting to server if it uses old (pre-4.1.1) protocol. (Defaults to on; use --skip-secure-auth to disable.) --server-arg=name Send embedded server this as a parameter....
A table reference is also known as a join expression. A table reference (when it refers to a partitioned table) may contain a PARTITION clause, including a list of comma-separated partitions, subpartitions, or both. This option follows the name of the table and precedes any alias declarati...
sink.ignore-null-when-update 更新数据时,如果传入的数据字段值为null,是更新对应字段为null,还是跳过该字段的更新。 否 BOOLEAN false 参数取值如下: true:不更新该字段。但是当Flink表设置主键时,才支持配置该参数为true。配置为true时: 如果是8.0.6及以下的版本,结果表写入数据不支持攒批执行。 如果是8.0.7及...
sink.ignore-null-when-update 更新数据时,如果传入的数据字段值为null,是更新对应字段为null,还是跳过该字段的更新。 否 BOOLEAN false 参数取值如下: true:不更新该字段。但是当Flink表设置主键时,才支持配置该参数为true。配置为true时: 如果是8.0.6及以下的版本,结果表写入数据不支持攒批执行。 如果是8.0.7及...
#情况一:类似于switch CASE 表达式 WHEN 值1 THEN 结果1或语句1(如果是语句,需要加分号) WHEN 值2 THEN 结果2或语句2(如果是语句,需要加分号) ... ELSE 结果n或语句n(如果是语句,需要加分号) END [case](如果是放在begin end中需要加上case,如果放在select后面不需要) CASE 语句的语法结构2: 代码语言:...