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Functions
- #arg
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- $(d)dql...
- $(db)sql;…
- ${macroExp}
- =expression
- >statement
- [a:b]
- @
- @x:…
- ~( i )
- A()
- A.( x,... )
- [a1,...an]
- abs()
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- align()
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- alter()
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- dynadb.close()
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- E()
- E()
- elapse()
- elasticnet()
- end s
- enum()
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- exists()
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- fetch()
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- filename()
- fill()
- fillcons()
- fillfun()
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- find()
- Fintrate()
- finv()
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- func()
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- get()
- gcd()
- gcs_bucket()
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- gcs_copy()
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- goto C
- group()
- groupc()
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- groups()
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- hbase_close()
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- memory()
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- minute()
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- mode()
- modify()
- mongo_close()
- mongo_open()
- mongo_shell()
- month()
- movefile()
- movmthd()
- mul()
- mse()
- mstd()
- msum()
- mvp()
- n.f(x)
- name()
- new()
- news()
- next{a}
- nodes()
- norm()
- norminv()
- not()
- now()
- ntile()
- null
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- numnorm()
- nvl()
- o()
- olap_close()
- olap_open()
- olap_query()
- ones()
- open()
- or()
- oss_bucket()
- oss_close()
- oss_copy()
- oss_file()
- oss_list()
- oss_open()
- output()
- p()
- pad()
- parse()
- paste()
- pca()
- pchipmthd()
- pdate()
- pearson()
- penum()
- periods()
- permut()
- pfind()
- pi()
- pivot()
- pjoin()
- pls()
- pmax()
- pmin()
- polyfit()
- pos()
- power()
- prior()
- proc()
- product()
- proportion()
- property()
- pseg()
- pselect()
- pseudo()
- psort()
- ptop()
- push()
- Qconnect()
- Qdirectory()
- Qenv()
- Qfile()
- Qload()
- Qlock()
- Qmove()
- query()
- r.(x,...)
- r.F
- r.F=x
- r2dbc_close()
- r2dbc_exec()
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- r2dbc_query()
- rand()
- rands()
- range()
- rank()
- ranki()
- rankm()
- ranks()
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- record()
- redis_close()
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- rename()
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- reportlite_config()
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- reportlite_open()
- reportlite_run()
- reset()
- result
- return xi
- rgb()
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- run()
- rvs()
- s3_bucket()
- s3_close()
- s3_copy()
- s3_file()
- s3_list()
- s3_open()
- sap_client()
- sap_close()
- sap_cursor()
- sap_execute()
- sap_getparam()
- sap_table()
- savepoint()
- sbs()
- se()
- second()
- segp()
- select()
- seq()
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- sf_close()
- sf_open()
- sf_query()
- sf_wsdlclose()
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- shift()
- sign()
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- size()
- skew()
- skip()
- sleep()
- smooth()
- sort()
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- spark_open()
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- spearman()
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- split()
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- sqlparse()
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- sqrt()
- step()
- string()
- structure
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- svm()
- swap()
- switch()
- syncfile(hs,p)
- system()
- T()
- tarcorskew()
- tan()
- tanh()
- time()
- tinv()
- to()
- top()
- total()
- transpose()
- trim()
- true
- try
- ttest_p()
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- union()
- update()
- upper()
- urlencode()
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- v()
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- var(V)
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- was_bucket()
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- year()
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- zeros()
- zip()
- zip_add()
- zip_close()
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- Intersection of sequences
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- Chart Elements
T.alter(F:x,…;F’,…)
Description:
Alter one or more fields in an entity table.
Syntax:
T.alter(F:x,…;F’,…)
Note:
The function, supported only when a table is of columnar storage, adds a field F to entity table/multizone entity table T and deletes an old field F’. Values of the new field are obtained by calculating expression x and populated to the table. The dimension and sorting field before it must not be modified.
Parameter:
|
T |
An entity table/multizone entity table |
|
F |
Name of the to-be-added field |
|
x |
An expression |
|
F’ |
An existing field |
Return value:
An entity table/multizone entity table
Example:
|
|
A |
|
|
1 |
=file("emp.ctx") |
An existing composite table file. |
|
2 |
=A1.open() |
Open the composite table’s base table. |
|
3 |
=A2.cursor().fetch() |
Query data in the base table.
|
|
4 |
=A2.alter(NEW_Salary:SALARY+1000;GENDER) |
Add NEW_Salary field to the base table through calculating expression SALARY+1000, and delete existing field GENDER. |
|
5 |
=A2.cursor().fetch() |
Check the base table and we can see that the new field is added and GENDER field is deleted.
|
