除了刚才提到的用COLLECT来做String Aggregation,还有个比较有名的方法就是Tom的STRAGG函数,如下, 这个其实就是个自定义的聚集函数,实现了Oracle Data Cartridge Interface中的几个 routines, 具体做法可以参见另一篇blog, Tom Kyte’s STRAGG scott@ORA9I.WORLD> creat
工作中用到一段比较复杂的SQL查询脚本,使用了listagg()函数实现了具有多个值的字段的填充(即,列表聚合,list aggregation(我猜的))。 说简单点,listagg()函数可以实现多列记录聚合为一条记录,从而实现数据的压缩、致密化(data densification)。 以下内容转载自http://dacoolbaby.iteye.com/blog/1698957,SQL脚本做了...
AggregationCommand(java.lang.String functionName) Creates anAggregationCommandthat specifies the aggregation of all of the summary data of the measures of a cube. AggregationCommand(java.lang.String functionName,FunctionArgument[] args,AggregationCase[] aggCases,MdmPrimaryDimensiondim,MdmHierarchy[] hiers...
AggregationCase(java.lang.String functionName,FunctionArgument[] args,MdmBaseMeasuremeasure) Creates anAggregationCasethat has the specified function, with function arguments, as the aggregation method for the specified measure. AggregationCase(java.lang.String functionName, java.util.List<FunctionArgument>...
Language SE Specification (names starting withjava), JavaFX modules (names starting withjavafx), JDK-specific modules (names starting withjdk) and Oracle-specific modules (names starting withoracle). Each module name is followed by a version string—@9indicates that the module belongs to Java 9....
LAG是一个分析函数。它可以在不使用自连接的情况下同时访问到一个表的多行数据。给一个或多个列名和一个游标位置(位移),LAG可以访问当前行之前的行,行之间间隔的行数为位移值。 语法树中的offset(位移)参数是可选的,可以指定一个大于0的整数,如果不指定offset(位移)参数函数会默认位移为1。语法...
JSON_STORAGE_FREE()shows the amount of space freed after it has been partially updated usingJSON_SET()orJSON_REPLACE(). This is greater than zero if the binary representation of the new value is less than that of the previous value. Each of these functions also accepts a valid...
2 新特性 : Online PDB relocate (PDB hot move) Relocating a PDB 是 Oracle 在 12C 中推出的一种新的数据迁移方式,在采用 Relocate 时可以使用最短的停机时间在不同的 CDB 之间直接迁移 PDB 。 Oracle 12.1 中 Relocate 迁移数据时,需要源库处于 read only 状态,但由于 12.2 中 local undo 的推出,可以...
String description = string; for (String abbr:(Set< String>)shorthand.keySet()) { description = description.replaceAll(abbr, (String)shorthand.get(abbr)); } return description; } public String getAsString(FacesContext facesContext, UIComponent uiComponent, Object object) { ...
maturation String RFC3339-encoded time of maturation (attestation) outcome u64 or null outcome value, if exists Each oracle is associated with one AssetPair, e.g. BTCUSD. Currently, the defined asset pairs are AssetPair BTCUSD To define more, see Asset Pairs. Output example: [ { "announcem...