If thealias_namecontains spaces, you must enclose(包围)thealias_namein quotes(双引号). if thealias_namecontains number,you must enclose thenalias_namein quotes.(myself addtion) It is acceptable to use spaces when you are aliasing a column name. However, it is not generally good practice to...
COL[UMN] [{ column|expr} [ option ...]] Option选项可以是如下的子句: ALI[AS] alias CLE[AR] FOLD_A[FTER] FOLD_B[EFORE] FOR[MAT] format HEA[DING] text JUS[TIFY] {L[EFT]|C[ENTER]|C[ENTRE]|R[IGHT]} LIKE { expr|alias} NEWL[INE] NEW_V[ALUE] variable NOPRI[NT]|PRI[NT] N...
COL[UMN] [{ column|expr} [ option ...]] Option选项可以是如下的子句: ALI[AS] alias CLE[AR] FOLD_A[FTER] FOLD_B[EFORE] FOR[MAT] format HEA[DING] text JUS[TIFY] {L[EFT]|C[ENTER]|C[ENTRE]|R[IGHT]} LIKE { expr|alias} NEWL[INE] NEW_V[ALUE] variable NOPRI[NT]|PRI[NT] N...
通过内部函数提高SQL 效率.: 复杂的SQL 往往牺牲了执行效率. 能够掌握上面的运用函数解决问题的方法在实际工作中是非常有意义的 使用表的别名(Alias): 当在SQL 语句中连接多个表时, 请使用表的别名并把别名前缀于每个Column 上.这样一来, 就可以减少解析的时间并减少那些由Column 歧义引起的语法错误. 15、识别'...
2、创建视图create [or replace] [force] view vname [(alias[,alias]...)] as SQL[with check option] [with read only];注释: or replace :覆盖 force :强制的;视图中的基表是否存在,都会创建 vname :创建的视图名称 [(alias[,alias]...)] :可选项,视图别名,可以由多个 SQL :SQL查询语句 with...
> </Description> <Aliases> <Alias name="F1 Revenue"/> </Aliases> <Columns> <RefPresentationColumn uid="80cb981e-0faa-0000-714b-e31d00000000" id="4010:1707" qualifiedName=""Sample Small".." Facts Revenue"."Revenue""/> <RefPresentationColumn qualifiedName...
15. 使用表的别名(Alias)当在SQL语句中连接多个表时, 请使用表的别名并把别名前缀于每个Column上.这样一来,就可以减少解析的时间并减少那些由Column歧义引起的语法错误。Column歧义指的是由于SQL中不同的表具有相同的Column名,当SQL语句中出现这个Column时,SQL解析器无法判断这个Column的归属。
在alias2中select出来的数据，每一条都跟alias1进行比较，若匹配，就进行更新操作，不匹配，执行插入操作。快速游标更新法： beginfor aa in (select a.rowid as rowid,b.ft_lstate as ft_lstate from gkfq_rec a,oa2_ftask bwhere a.slid=b.fi_inst ) loopupdate gkfq_rec set blzt...
Create or replace view testview as select col1,sum(col2) col2_alias from table_name; /*创建复杂视图*/ Create view view_name (alias1,alias2,alias3,alias4) as select d.col1,min(e.col1),max(e.col1),***g(e.col1) from table_name1 e,table_name2 d where e.col2=d.col2 ...
When a report throws this error message, adjust the SQL query to provide a column alias for the ROWID column.5.1.6 Changes to Interactive Reports This release introduces the following changes to the engine executing interactive reports in order to support REST enabled SQL and REST Services: ...