DB2 Special Functions

原创于 2009-12-05 14:07:57 发布 · 249 阅读

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本文介绍如何在SQL中进行保留小数位数的除法运算，并提供了一个具体的例子。此外，还展示了如何判断指定的表是否存在于数据库中。

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除法

保留小数的除法. (比如保留两位小数)

例子: 如何实现类似的算式 12345/100 = 123.45

cast( ROUND( DECIMAL( 12345, 13, 2)/100, 2) as decimal(13,2) )

判断一个Table是否存在

SELECT COUNT(*) 
INTO :isTablePresent
FROM FROM SYSCAT.TABLES
WHERE SYSCAT.TABLES.TABSCHEMA = 'MYSCHEMANAME' AND   
		SYSCAT.TABLES.TABNAME  = 'MYTABLENAME'
;

--If isTablePresent == 0 then the table does not exist, if isTablePresent == 1 the table exists, other values are impossible.

db2 -tvf myscript.db2     => option flags
db2 connect to sample     => SQL statement
db2 list tables for user  => DB2 command
db2 ?                     => general CLP help
db2 ? options             => current CLP options settings
db2 ? help                => help for syntax online help
db2 ? backup              => help for a specific DB2 command
db2 ? sql0117N            => help for a specific SQLCODE
db2 ? 42501               => help for a specific SQLSTATE
db2 ? 01                  => help for a specific class code