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Functions
- #c
- $(db)sql;…
- $()sql;…
- ${macroExp}
- =expression
- >statement
- [a:b]
- @
- A()
- A.( x )
- [a 1 ,…a n ]
- abs()
- acos()
- acosh()
- age()
- align()
- ali_client()
- ali_close()
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- and()
- append()
- array()
- asc()
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- base64 ()
- between()
- bits()
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- C
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- call()
- call path/dfx( … )
- callx()
- callx( dfx,...;h,s;x )
- cand()
- canvas()
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- channel()
- char()
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- clipboard()
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- count()
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- covm()
- create()
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- cursor()
- date()
- datetime()
- day()
- days()
- decimal()
- delete()
- deq()
- derive()
- dfx ( … )
- diff()
- directory()
- dis()
- dism()
- dup()
- elapse()
- end s
- enum()
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- es_close ()
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- fact()
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- fetch()
- field()
- file()
- filename()
- find()
- Fintrate()
- Firr()
- float()
- floor()
- Fmirr()
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- for
- fork
- fork A i ,…
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- func()
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- hive_close()
- hive_cursor()
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- hive_query()
- hosts()
- hour()
- httpfile()
- I()
- icursor()
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- id()
- if
- if()
- ifa()
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- ifv()
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- import()
- index()
- inf()
- insert()
- int()
- interval()
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- isalpha()
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- iselect()
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- keys()
- lcm()
- left()
- len()
- lg()
- like()
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- lock()
- long()
- lower()
- m()
- mae()
- max()
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- mcursor()
- md5()
- median()
- memory()
- merge()
- Mergex()
- mid()
- millisecond()
- min()
- minp()
- minute()
- modify()
- mongo_close ()
- mongo_insert()
- mongo_open()
- mongo_shell()
- month()
- movefile()
- mul()
- mse()
- n.f( x )
- name()
- new()
- news()
- next{a}
- nodes()
- not()
- now()
- null
- number()
- nvl()
- olap_close()
- olap_open()
- open()
- olap_query()
- or()
- output()
- p()
- pad()
- parse()
- paste()
- pdate()
- penum()
- periods()
- permut()
- pfind()
- pi()
- pivot()
- pmax()
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- polyfit()
- pos()
- power()
- prior()
- proc()
- product()
- property()
- pseg()
- pselect()
- psort()
- ptop()
- push()
- query()
- r.( x )
- r.F
- r.F=x
- rand()
- rands()
- range()
- rank()
- ranks()
- read()
- record()
- redis()
- redis_close()
- redis_cluster()
- redis_get()
- redis_getrange()
- redis_hkeys()
- redis_hlen()
- redis_hmget()
- redis_hvals()
- redis_keys()
- redis_lindex()
- redis_llen()
- redis_lrange()
- redis_pool()
- redis_scard()
- redis_sdiff()
- redis_select()
- redis_sentinel()
- redis_shared()
- redis_sharedpool()
- redis_sinter()
- redis_sismember()
- redis_smembers()
- redis_srandmember()
- redis_strlen()
- redis_sunion()
- redis_type()
- redis_zcard()
- redis_zcount()
- redis_zrange()
- redis_zrangebyscore()
- redis_zrank()
- redis_zscore()
- regex()
- register()
- rename()
- replace()
- report_config()
- report_exportHtml()
- report_exportPdf()
- report_exportXls()
- report_open()
- report_run()
- reset()
- result
- return xi
- rgb()
- right()
- rollback()
- round()
- run()
- rvs()
- sap_client ()
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- sap_cursor ()
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- sap_getparam ()
- sap_table ()
- savepoint()
- second()
- segp()
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- shift()
- sign()
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- size()
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- skip()
- sleep()
- sort()
- sortx()
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- spark_close()
- spark_cursor()
- spark_query()
- split()
- sqlparse()
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- SQL +
- substr()
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- stax_connect ()
- stax_query ()
- sqrt()
- step()
- string()
- sum()
- swap()
- switch()
- sync()
- system()
- tan()
- tanh()
- time()
- to()
- top()
- total()
- transpose()
- trim()
- true
- try
- union()
- update()
- upper()
- urlencode ()
- v()
- var()
- web_crawl()
- words()
- workday()
- workdays()
- write()
- ws_call()
- ws_client()
- xjoin()
- xjoinx()
- xlscell()
- xlsclose()
- xlsexport()
- xlsimport()
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- xlswrite()
- xml()
- xor()
- year()
- ym_build_model()
- ym_close()
- ym_env()
- ym_exec()
- ym_importance()
- ym_json()
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- ym_model()
- ym_performance()
- ym_pre_performance()
- ym_predict()
- ym_present()
- ym_result()
- ym_save_pcf()
- ym_setparam()
- ym_server_quit()
- ym_statistics()
- ym_target()
- z()
- zip()
- zip_add()
- zip_close ()
- zip_compress()
- zip_del()
- zip_encrypt()
- zip_extract()
- zone()
- Intersection of sequences
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- Hexadecimal long integer
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- Chart Elements
cs .derive()
Description:
Add one or more fields to a cursor.
Syntax:
cs.derive(xi :Fi,…)
Note:
The function adds Fi,… fields to cursor cs, making a new cursor having “orginal fields of channel ch plus Fi,…”, and then traverses each of the records of cs to compute expression xi. It supports multicursors.
Parameters:
|
cs |
Cursor |
|
Fi |
Field name. In this case, Fi cannot be of the same name as the existing fields in cs |
|
xi |
Expression, whose computed results are the field values |
Options:
|
@i |
Won’t generate a record if the result of expression xi is null (this won’t affect a record with null value in the original table sequence) |
Return value:
The original cursor cs
Example:
|
|
A |
|
|
1 |
=demo.cursor("select NAME,BIRTHDAY,HIREDATE from Employee") |
|
|
2 |
=A1.derive(interval@y(BIRTHDAY,HIREDATE):EntryAge, age(HIREDATE):WorkAge) |
Add fields EntryAge and WorkAge to the original cursor. |
|
3 |
=A2.fetch() |
|
|
4 |
=file("D:\\txt_files\\data1.txt").cursor@t() |
Below is the file data1.txt:
|
|
5 |
=A4.derive@i(SCORE:score_not_null) |
If the SCORE value is null, the corresponding record won’t be generated
|
|
6 |
=A5.fetch() |
|
Related functions: