db2 | 易学教程

SQL Query to truncate table in IBM DB2

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问题 Can any one give me the syntax to truncate a table in IBM DB2. I m running the following command: truncate table tableName immediate; The eror is DB2 SQLCODE=-104, SQLSTATE=42601, SQLERRMC=table;truncate ;JOIN , DRIVER=3.50.152 Message: An unexpected token "table" was found following "truncate ". Expected tokens may include: "JOIN ".. SQLCODE=-104, SQLSTATE=42601, DRIVER=3.50.152 The syntax matches the one specified in the reference docs of IBM : http://publib.boulder.ibm.com/infocenter

Connecting to an IBM AS/400 DB2 Database

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问题 I'm trying to connect to a client's IBM AS/400 DB2 Database from an Ubuntu Server using PHP's ODBC Driver . I have the unixODBC installed as well. My odbcinst.ini looks like this: [IBM DB2 ODBC DRIVER] Description = ODBC 5.1 Driver for Database Driver = /usr/lib/x86_64-linux-gnu/odbc/libmyodbc.so FileUsage = 1 And my odbc.ini looks like this: [IBM DB2 ODBC DRIVER] Driver = IBM DB2 ODBC DRIVER Description = ODBC 5.1 Driver DSN Now, my code to connect is: $server = '12.345.678.90' //IP $port =

DB2和Oracle中唯一约束和唯一索引对比

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db2创建唯一性约束： db2 => connect to sample 数据库连接信息数据库服务器 = DB2/NT 10.1.0 SQL 授权标识 = ADMINIST... 本地数据库别名 = SAMPLE 创建表db2admin.test，允许字段id为空。从下面的过程可以看出，db2中的唯一性约束不允许列值为空。 db2 => create table db2admin.test(id int) DB20000I SQL 命令成功完成。 db2 => alter table db2admin.test add constraint unique_test_id unique(id) DB21034E 该命令被当作 SQL 语句来处理，因为它是无效的“命令行处理器”命令。在 SQL 处理期间，它返回： SQL0542N 名为 "ID" 的列不能是主键或者唯一键约束的列，因为它可以包含空值。 SQLSTATE=42831 db2 => alter table db2admin.test alter column id set not null DB20000I SQL 命令成功完成。 db2 => alter table db2admin.test add constraint unique_test_id unique(id) DB21034E 该命令被当作 SQL

Export data from db2 with column names

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问题 I want to export data from db2 tables to csv format.I also need that first row should be all the column names. I have little success by using the following comand EXPORT TO "TEST.csv" OF DEL MODIFIED BY NOCHARDEL coldel: , SELECT col1,'COL1',x'0A',col2,'COL2',x'0A' FROM TEST_TABLE; But with this i get data like Row1 Value:COL1: Row1 Value:COL2: Row2 Value:COL1: Row2 Value:COL2: etc. I also tried the following query EXPORT TO "TEST.csv" OF DEL MODIFIED BY NOCHARDEL SELECT 'COL1',col1,'COL2'

Which is the best method to store files on the server (in database or storing the location alone)?

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问题 In my project (similar to mediafire and rapidshare ), clients can upload files to the server. I am using DB2 database and IBM WAS web server and JSP as server side scripting . I am creating my own encryption algorithm, as it is the main aim of the project. I need suggestion whether files themselves should be stored in the database or if only the location of the files should be stored. Which approach is best? 回答1: There are Pros and Cons for storing BLOBs in the database. Advantages DBMS

DB2- How to check if varchar field value has integers

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问题 Is there an inbuilt DB2 function or any query to check if the character i have is a number? (I cannot use user defined functions) 回答1: Doc Link CASE WHEN LENGTH(RTRIM(TRANSLATE(test_str, '*', ' 0123456789'))) = 0 THEN 'All digits' ELSE 'No' END 回答2: There are many approaches. Take a look at that solution using only two functions: CASE WHEN REPLACE(TRANSLATE(test_str, '0','123456789','0'),'0','') = '' THEN 'All digits' ELSE 'Not all digits' END In general - less functions - better performance

PHP/Linux to AS/400-db2

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问题 I am trying to get php on Linux Centos server access as/400 (iSeries) db2 database. I am using this IBM guide as much as possible, (though we could not get GUI configuration utility working.) http://www-03.ibm.com/systems/i/soft...ide/index.html I downloaded and successfully installed iSeriesAccess drivers and pre-requisites. rpm -i iSeriesAccess-5.4.0-1.6.i386.rpm I have configured these files to define drivers/DNS: /etc/odbc.ini and /etc/odbcinst.ini [iSeries Access ODBC Driver] Description

How do I use DB2 Explain?

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问题 How do I use DB2's Explain function? -- both to run it, and to use it to optimize queries. Is there a better tool available for DB2? I've built queries before, but the only way I've had to tell how long they'd take is to run them and time them -- which is hardly ideal. Edit: The answer for me turned out to be "You can't. You don't have and cannot get the access." Don't you love bureaucracy? 回答1: What you're looking for is covered by two DB2 utilities: The explain utility, which shows the

How to check db2 version

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问题 How to check db2 version on Z/OS using only SQL commands? Thanks, Melita 回答1: You can try the following query: SELECT service_level, fixpack_num FROM TABLE (sysproc.env_get_inst_info()) as INSTANCEINFO It works on LUW, so I can't guarantee that it'll work on z/OS, but it's worth a shot. 回答2: SELECT GETVARIABLE('SYSIBM.VERSION') FROM SYSIBM.SYSDUMMY1 回答3: There is also the env_inst_info admin view. As with CanSpice I can only vouch for LUW, but there should at least be a similar view available

Select one row per index value with max column value

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问题 With a table setup with the following fields: SKU, EVENTSTARTDATE, EVENTENDDATE, PRICE, (...etc...) and housing thousands of rows here is example data (dates are YYMMDD, century code excluded): 1111111, 101224, 101231, 10.99 1111111, 110208, 110220, 9.99 1111111, 110301, 110331, 8.99 2222222, 101112, 101128, 15.99 2222222, 101201, 110102, 14.99 etc I'd like to have a SELECT statement return one row per SKU with the maximum EVENTSTARTDATE without having a WHERE clause isolating a specific SKU