Simplify the use of the general function of the column may contain null values. These functions accept all data types of input parameters. NVL function NVL function to assess any data type of column or expression is not empty. If the original item is null
1, Table Export Import Export Table Article_Detail: expdp wdm_app_2/1234 @ orcl_9 tables = ARTICLE_DETAIL directory = DATA_PUMP_DIR dumpfile = Article_Detail.dmp logfile = Expdp_Article_Detail.log compression = NONE content = ALL reuse_dumpfiles = y ...
If the SELECT statement are used Alias, DISTINCT operator, expression, SET (union, union all, minus, intersect) operators, , or aggregate (count, max, mix, avg) functions, you can not update query return value ; eg: TABLE: emp id name salary ======== ...
Source: Net sea cockle-pickers Oracle database for its power and stability of the known, but, in the development and management there are many difficulties, the author This summarizes some Oracle database development and management of common problems ...
