SDLC include following phases;

Requirement And Analysis

Designing

Coding

Testing

Implementation

STLC include the following phases:

Test Plan

Preparation of test cases and executing them

Test Log

Defect Tracking

Report Generation

SDLC

1.Requirement phase,

2.Desing phase(HLD,DLD(Program spec))

3.Coding

4.Testing

5.Release

6.Maintenance

STLC

1.Requirements knowledge transfer

2.Test planning

3.Writting Test case or scripts

4.executing test case

5.Bug tracking

SDLC

1.Requirement phase,

2.Desing phase(HLD,DLD(Program spec))

3.Coding

4.Testing

5.Release

6.Maintenance

STLC

1.Requirements knowledge transfer

2.Test planning

3.Writting Test case or scripts

4.executing test case

5.Bug tracking

Diff between system testing and functional testing

Functional testing is the technique utilized in the system tesing.Its a black box testing type... Functional testing is noting but testing or check whether a sytem functions properly as per the req.. 

system testing is the phase after integration testing phase.After all modules get integrated and tested for integration, the system is tested as a whole.