因此在提取json汇总的value时,常常以get_json_object(strin,'[∗].key′)提取外层含有[]的json串,以getjsonobject(strin,′.key')提取外层无[]的json串。 列传多行常常会用到lateral view explode (split(ids,',')) t as id,其实际可理解为explode后的表t(该表只有一个字段)与原始表进行笛卡尔积。 提...
(sqlservr*)\% User Time"), ("\\$serverName"+"\Process(sqlservr*)\% Privileged Time") )Get-Counter-Counter$Counters-MaxSamples30|ForEach{$_.CounterSamples |ForEach{ [pscustomobject]@{ TimeStamp =$_.TimeStamp Path =$_.Path Value = ([Math]::Round($_.CookedValue,3)) }Start-Sleep...
values(1,1,'关羽','男','1988-8-8',12000,'13985745871','荆州',getdate()) insertintoPeople(DepartmentId,RankId,PeopleName,PeopleSex,PeopleBirth,PeopleSalary,PeoplePhone,PeopleAddress,PeopleAddTime) values(2,1,'张飞','男','1990-8-8',8000,'13535987412','宜昌',getdate()) insertintoPeople(...
此缓冲区的最大大小可以通过 Connection.execution_options.max_row_buffer 执行选项受到影响: with engine.connect() as conn: with conn.execution_options(stream_results=True, max_row_buffer=100).execute( text("select * from table") ) as result: for row in result: print(f"{row}") 虽然...
row format delimited fields terminated by '\t' 指定字段分隔符,默认分隔符为 '\001' stored as 指定存储格式 location 指定存储位置 根据查询结果创建表 createtablestu3asselect*fromstu2; 根据已经存在的表结构创建表 createtablestu4likestu2; 查询表的结构 ...
使用WITH RECOMPILE 选项执行存储过程。为了使语句正确,或要获得可能更快的查询执行计划,大多数都需要进行重新编译。在低于 2005 版的 SQL Server 版本中,只要批处理中的语句导致重新编译,就会重新编译整个批处理,无论此批处理是通过存储过程、触发器、临时批处理还是预定义语句提交的。 从 SQL Server 2005 (...
get_json_object(string json_string, string path) 形如json的字符串中提取value,如果该字符串是非法的json,则返回NULL int length(string A) 返回字符串的长度 string lower(string A) lcase(string A) 转为小写 string lpad(string str, int len, string pad) 左填充至指定长度,如果字符串长度大于制定长度...
VALUE DESCRIPTOR NULLIF VALUES DIAGNOSTICS NUMERIC VARCHAR DISCONNECT OCTET_LENGTH VARYING DISTINCT OF VIEW DOMAIN ON WHEN DOUBLE ONLY WHENEVER DROP OPEN WHERE ELSE OPTION WITH END OR WORK END-EXEC ORDER WRITE ESCAPE OUTER YEAR EXCEPT OUTPUT
-- To avoid storing the login and password in the script file, the value-- is passed into SQLCMD as a scripting variable. For information about-- how to use scripting variables on the command line and in SQL Server-- Management Studio, see the "Executing Replication Scripts" section in-...
添加默认值:alter table tb_name alter 列名 set default df_value 删除字段:drop alter table tb_name drop 字段名 索引 添加索引:add(常用:create index index_name on tb_name(列名,...);) alter table tb_name add index [ix_name] (列名,...); 添加唯一键:alter table tb_name add unique...