Overlay values in master data set with non-missing values from a second data set.

Note:   Update uses observations from the transaction data set to change the values of the corresponding observations from the master data set. You must use a BY statement. Data needs to be in sorted order, or indexed.

Update works with two data sets only.

Note that if the master data set contains duplicates of the BY variable, the first observation is updated and the remaining observations are ignored.

If the transaction data set contains duplicates, all values overlay the first match in master.

If your goal is to update all the observations in master, consider using MERGE instead.

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These sample files and code examples are provided by SAS Institute Inc. "as is" without warranty of any kind, either express or implied, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Recipients acknowledge and agree that SAS Institute shall not be liable for any damages whatsoever arising out of their use of this material. In addition, SAS Institute will provide no support for the materials contained herein.

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/**************************************************************/
/* Create pretend data.  DSD assumes the delimiter is a comma */
/* and strips the double quotes from the values with embedded */
/* delimiters.                                                */
/*                                                            */
/* A WARNING will be issued to the log due to the duplicates  */
/* found in master.                                           */
/**************************************************************/

data one;
  infile datalines dsd;
  input artist $ song :$30.;
datalines;
Abba,"Knowing Me, Knowing You"
Abba,I am the City
Abba,Mama Mia
Beatles,Blackbird
Beatles,Chains
Beatles,"Ob-La-Di, Ob-La-Da"
;

data two;
  infile datalines dsd;
  input artist $ song :$30. new;
datalines;
Abba,Waterloo,1
Beatles,Glad All Over,1
Beatles,Hey Jude,1
Doors,People Are Strange,1
;

data new;
  update one two;
  by artist;
run;

proc print data=new;
run;

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These sample files and code examples are provided by SAS Institute Inc. "as is" without warranty of any kind, either express or implied, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Recipients acknowledge and agree that SAS Institute shall not be liable for any damages whatsoever arising out of their use of this material. In addition, SAS Institute will provide no support for the materials contained herein.

Obs    artist     song                  new

 1     Abba       Waterloo               1
 2     Abba       I am the City          .
 3     Abba       Mama Mia               .
 4     Beatles    Hey Jude               1
 5     Beatles    Chains                 .
 6     Beatles    Ob-La-Di, Ob-La-Da     .
 7     Doors      People Are Strange     1

Overlay values in master data set with non-missing values from a second data set.

Type:	Sample
Topic:	SAS Reference ==> DATA Step SAS Reference ==> Statements ==> File-handling ==> UPDATE Common Programming Tasks ==> Combining Data Data Management ==> Manipulation and Transformation ==> Combining and Modifying Data Sets

Date Modified:	2005-12-08 11:34:34
Date Created:	2004-09-30 14:09:13

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