'rows-per-second'='2','fields.show_params.length'='1','fields.log_id.min'='1','fields.log_id.max'='100');--点击日志数据CREATETABLEclick_log_table(log_idBIGINT,click_paramsSTRING)WITH('connector'='datagen','rows-per-second'='2','fields.click_params.length'='1','...
SQL STRING_AGG function is supported by SQL Server version 2017 and higher. STRING_AGG is a built-in string function used to concatenate multiple rows of data into a single string. This function takes all expressions from rows, convert into string type, and concatenates them into a single str...
rows :通过索引查询到的数据量 Extra :额外的信息 建表语句和插入数据: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 # 建表语句 create tablecourse(cidint(3),cnamevarchar(20),tidint(3));create tableteacher(tidint(3),tnamevarchar(20),tcidint(3));create tableteacherCard(tcidint(3),tcde...
9- 删除行 | Deleting Rows 01:25 10- 恢复数据库 | Restoring the Databases 01:07 【第五章】1- 聚合函数 | Aggregate Functions「汇总数据」 09:20 2- GROUP BY子句 | The GROUP BY Clause 07:22 3- HAVING子句 | The HAVING Clause 08:51 4- ROLLUP运算符 | The ROLLUP Operator 05:06 【第...
如果为Left Join案例: CREATE TABLE show_log_table ( log_id BIGINT, show_params STRING ) WITH ( 'connector' = 'datagen', 'rows-per-second' = '1', 'fields.show_params.length' = '3', 'fields.log_id.min' = '1', 'fields.log_id.max' = '10' ...
1.select子句中尽量避免使用* select子句中，*是选择全部数据的意思。比如语句：“select * from 成绩表...
SQL_CA2_MAX_ROWS_AFFECTS_ALLSQL_CA2_CRC_EXACTSQL_CA2_CRC_APPROXIMATESQL_CA2_SIMULATE_NON_UNIQUESQL_CA2_SIMULATE_TRY_UNIQUESQL_CA2_SIMULATE_UNIQUE有关这些位掩码的说明,请参阅SQL_DYNAMIC_CURSOR_ATTRIBUTES2(并在说明中将“静态游标”替换为“动态游标”。 SQL_STRING_FUNCTIONS 1.0 注意:ODBC 1.0 中引入...
createexternaltablestudent (s_idstring,s_namestring) rowformatdelimited fields terminated by'\t'; 从本地文件系统向表中加载数据 追加操作loaddatalocalinpath'/export/servers/hivedatas/student.csv'intotablestudent; 覆盖操作loaddatalocalinpath'/export/servers/hivedatas/student.csv'overwrite intotablestudent...
INSERT INTO [StudentScores] SELECT '码农', '生物', 78 2、行转列sql SELECT * FROM [StudentScores] /*数据源*/ AS P PIVOT ( SUM(Score/*行转列后 列的值*/) FOR p.Subject/*需要行转列的列*/ IN ([语文],[数学],[英语],[生物]/*列的值*/) ...
INTO SET CONTAINSTABLE IS SETUSER CONTINUE JOIN SHUTDOWN CONVERT KEY SOME CREATE KILL STATISTICS CROSS LEFT SYSTEM_USER CURRENT LIKE TABLE CURRENT_DATE LINENO TABLESAMPLE CURRENT_TIME LOAD TEXTSIZE CURRENT_TIMESTAMP MERGE THEN CURRENT_USER NATIONAL ...