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"Trigger" is the mechanism to activate/ Extract information from the source system for use in Target system . In DBSync the Trigger section is as shown below, Trigger facilitates the information to be read from the source system through a mechanism called Query Builder.

There are a advanced version of query building mechanism , where complex queries involving across multiple objects are created , result set can also be viewed at run-time making it convenient for the user to change the query as and when. 

1. Initially, when the user lands on this Workflow detail page , he/she will have to select the Data source and the object on which the query is to be built
2. He/She can add N number of condition for the query being built by clicking on "Add New Condition"
3. For adding a condition user has to select the field, select the operator and enter the value with in ' '
4. Basing on the number of conditions added , the filter logic is auto populated and by chance if he/she wishes to change the logic they can do by entering the value 
5. Clicking on the preview button adjacent to filter logic will show the result set in Query Result section.

The below table demonstrates the operators supported and meanings of each operations  .

The advanced query builder lets the user to build complex queries , the advanced query builder contains three section 

1. Schema , which loads up the whole of source schema with whole table, can be expanded to show the columns with respective data types 
2. Query Builder, where query will be pre loaded for Templates loaded from Template library and a user can write their own queries .
3. Query Result , which will show the result for relational data models and for XML structures the data is shown in tree format.