http://www.ibm.com/developerworks/cn/data/library/techarticle/dm-1312db2blu-cubeCREATE TABLE "DB2INST1"."PRODUCT_DIM" ( "PRODUCT_KEY" INTEGER NOT NULL , "PRODUCT_NAME" VARCHAR(150 OCTETS) , "PRODUCT_INTRODUCTION_DATE" TIMESTAMP NOT NULL , "PRODUCT_DISCONTINUED_DATE" TIMESTAMP , "PRODUCT_BRAND" VARCHAR(90 OCTETS) , "PRODUCT_COLOR" VARCHAR(90 OCTETS) , "PRODUCT_LINE" VARCHAR(90 OCTETS) NOT NULL , "PRODUCT_SIZE" VARCHAR(90 OCTETS) , "PRODUCT_TYPE" VARCHAR(120 OCTETS) NOT NULL ) IN "USERSPACE1" ORGANIZE BY COLUMN; 这么定义 VARCHAR(90 OCTETS) 是从 COGNOS 生成出来的吗 ?和 一般的VARCHAR(90) 有什么不同吗 ?