What are the three languages were adopted by DBTG?

The DBTG (Data Base Task Group) didn't adopt languages. It was a group that worked on standardizing the Data Base Language, which is also known as DBTG DML.

However, DBTG DML was influenced by several existing languages of the time, including:

1. COBOL: DBTG DML borrowed heavily from COBOL's syntax and structure, making it familiar to programmers already working with COBOL.

2. ALGOL: The concept of data structures and operations in DBTG DML had roots in ALGOL, another popular programming language of the era.

3. SQL: While SQL wasn't finalized when DBTG was active, the concepts of relational databases and structured query language influenced the development of DBTG DML.

While not officially adopted, these languages served as inspiration for DBTG DML, contributing to its design and functionality.