mergeColumns

Concatenates the values in two columns, joins them by with string, and stores the resulting value in a new column.

Available attributes

Name	Description	Required for	Supports
catalogName	Name of the catalog		all
column1Name	Name of the column containing the first half of the data	all	all
column2Name	Name of the column containing the second half of the data	all	all
finalColumnName	Name of the column to create	all	all
finalColumnType	Data type of the column to create	all	all
joinString	String to place include between the values from column1 and column2 (may be empty)		all
schemaName	Name of the schema		all
tableName	Name of the table containing the columns to join	all	all

XML example

<changeSet  author="liquibase-docs"  id="mergeColumns-example">  
    <mergeColumns  catalogName="cat"  
            column1Name="first_name"  
            column2Name="last_name"  
            finalColumnName="full_name"  
            finalColumnType="varchar(255)"  
            joinString="A String"  
            schemaName="public"  
            tableName="person"/>  
</changeSet>

YAML example

changeSet:  
  id:  mergeColumns-example  
  author:  liquibase-docs  
  changes:  
  -  mergeColumns:  
      catalogName:  cat  
      column1Name:  first_name  
      column2Name:  last_name  
      finalColumnName:  full_name  
      finalColumnType:  varchar(255)  
      joinString:  A String  
      schemaName:  public  
      tableName:  person

JSON example

{  "changeSet":  {  "id":  "mergeColumns-example",  "author":  "liquibase-docs",  "changes":  [  {  "mergeColumns":  {  "catalogName":  "cat",  "column1Name":  "first_name",  "column2Name":  "last_name",  "finalColumnName":  "full_name",  "finalColumnType":  "varchar(255)",  "joinString":  "A String",  "schemaName":  "public",  "tableName":  "person"  }  }]  }  }

SQL example

ALTER  TABLE  public.person  ADD  full_name  VARCHAR(255)  NULL;  

UPDATE  cat.person  SET  full_name  =  CONCAT_WS(first_name,  
 'A String',  
 last_name);  

ALTER  TABLE  public.person  DROP  COLUMN  first_name;  

ALTER  TABLE  public.person  DROP  COLUMN  last_name;

Database support

Database	Notes	Auto rollback
DB2/LUW	Supported	No
DB2/z	Not Supported	No
Derby	Not Supported	No
Firebird	Supported	No
H2	Supported	No
HyperSQL	Supported	No
INGRES	Supported	No
Informix	Supported	No
MariaDB	Supported	No
MySQL	Supported	No
Oracle	Supported	No
PostgreSQL	Supported	No
SQL Server	Supported	No
SQLite	Supported	No
Sybase	Supported	No
Sybase Anywhere	Supported	No