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boolean exists = lambdaQuery().eq(ConferenceUserThird::getConferenceId, userThird.getConferenceId()).eq(ConferenceUserThird::getPhone, userThird.getPhone()).exists();
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boolean exists = lambdaQuery().eq(ConferenceUserThird::getConferenceId, userThird.getConferenceId()).eq(ConferenceUserThird::getPhone, userThird.getPhone()).exists();
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