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How to include column headers also with the export result in IBM DB2

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问题 I was trying to export data from table in DB2 using command..I m abo to export into csv file..But column headers are not there..Need to have column headers as well.So what I can add in the sql query to get column headers as well 回答1: This is possible in the latest (2019) Db2 11.5 release and Db2 Warehouse (local and on Cloud) with EXTERNAL TABLE feature via INCLUDEHEADER / COLUMN_NAMES switch, see an example $ db2 "create external table '/home/db2v115/staff.csv' using (delimiter ','

Select all rows in a group where within the group, one column has one specific value, and another column has another specific value on the next row

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问题 I am new to SQL, so I’m not sure which approach is best for this kind of task: I have a table where groups of rows all relate to the same item, whose name appears in the first column. Other details appear in the other columns. I am trying to retrieve all rows for every group based on having the same value in the first column, where every time a certain value appears in one column, another value appears in a different column in the following row. | Fruit | Value1| Value2| ---------------------

Select all rows in a group where within the group, one column has one specific value, and another column has another specific value on the next row

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Mule database connector url format for DB2 not correct

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问题 I am trying Mule's Database Connector to connect to a DB2 database but I couldn't figure out the correct format for the database URL. I created a Generic Database Configuration global element with Database URL jdbc:db2://db01.dev.myserver.org:50000/mydb;User=test;Password=secret And Driver com.ibm.db2.jcc.DB2Driver When I click Test Connection, it says Test connection failed: Cannot get connection for URL jdbc:db2://db01.dev.myserver.org:50000/mydb;User=test;Password=secret : [ibm][db2][jcc]

DB2 SQL Function with dynamic return value

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问题 I have the following working DB2 SQL function CREATE OR REPLACE FUNCTION selector (param VARCHAR(3)) RETURNS TABLE (id INT, CMD VARCHAR(1024), ATTR CHAR(10)) LANGUAGE SQL DETERMINISTIC NO EXTERNAL ACTION RETURN SELECT id, cmd, attr FROM test.commandtbl c WHERE c.attr=param; Calling it like: select * from table (selector('c'))! The problem is that I want the return table to be dynamic in size and type. I want to use the function with a lot of return fields and and while testing I don't want to

MySQL 数据库自动备份 Shell 脚本

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 今天这个备份分二个版本一个是linux上直接安装的mysql，另一种是docker上安装的mysql。基本操作都一样只是备份sql语句不同而已。可以选择设置需要备份的库，自动备份压缩，自动删除 7 天前的备份，需要使用 crontab 定时执行。创建一个 mysql.sh 文件要备份的数据库名，多个数据库用空格隔开 #!/bin/bash databases=(db1 db2 db3) 备份文件要保存的目录 basepath='/usr/local/mysql/' if [ ! -d "$basepath" ]; then mkdir -p "$basepath" fi 循环databases数组 for db in ${databases[*]} do 每个数据库文件夹 if [ ! -d "$basepath$db" ]; then mkdir -p "$basepath$db" fi 备份数据库生成SQL(Linux)文件 /bin/nice -n 19 /usr/bin/mysqldump -uUSER -pPASSWORD $db > $basepath$db/$db-$(date +%Y%m%d).sql 备份数据库生成SQL(Docker)文件 docker exec mysql

Delete from multiple tables in one single query

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问题 I am a beginner in DB2. I want to delete from 2 tables using one query. The reason why I want to do that is because the condition for delete is complex and implies JOIN in big tables. I don't want to do the same query twice. Basically I want something like that : DELETE from table1 t1, table2 t2 WHERE t1.ID = t2.ID AND ID in ( -- some select and JOIN stuff) 回答1: With DB2 for LUW you can do something like this using the data change table reference : WITH lst (id) as ( -- some select and JOIN

How to escape two single quotes in DB2?

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问题 E.g: Code='' . If I use Code ='''' , in the result I'm getting only one quote. 回答1: Keep the current start and end quotes. Then double each quote supposed to be a part of the string value. Code = '''''' Or you can perhaps use a Unicode string literal: Code = U&'\0027\0027' 回答2: More information in your qustion would be helpful. Which OS or where exactly you execute it. Here is a working example from a Db2 command line: db2 create table str(text varchar(20)) DB20000I The SQL command completed

SQLCode=-138 flagging on large count tables but not small DB2

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问题 I built a view in which I'm using the following code to pull only the Last name from a field that is formatted 'LastName,FirstName': VALUE(RTRIM(SUBSTR(A.PREVIOUS_NAMES,1,LOCATE(',', A.PREVIOUS_NAMES)-1)), '') AS "PREVIOUS_NAME", This view worked fine as I was working in our sandbox environment, but as I moved it up to test, and try to open the view in DBVisualizer, the data results provide the Error: THE SECOND OR THIRD ARGUMENT OF THE SUBSTR OR SUBSTRING FUNCTION IS OUT OF RANGE. SQLCODE=

For common elements, how to find the value based on two columns? SQL

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问题 I am using DB2 by IBM; however I am hoping this can be done using the SQL standard without using the additional functions added by each DB manufacturer. My Problem: For every CID (customer ID) I need to find the CLUB from which the most purchases were made. In the table below, customer #1 ('cid =1') bought the most books from the club 'Readers Digest'. I can get this part done using: Find most frequent value in SQL column However CID=2 is much harder (for me), and I am stuck. For 'cid = 2' we