1.缺少依賴包錯誤
warning: mysql-community-client-5.7.26-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
error: Failed dependencies:
mysql-community-server(x86-64) >= 5.7.9 is needed by mysql-community-test-5.7.26-1.el7.x86_64
perl(Data::Dumper) is needed by mysql-community-test-5.7.26-1.el7.x86_64
perl(JSON) is needed by mysql-community-test-5.7.26-1.el7.x86_64
perl(Time::HiRes) is needed by mysql-community-test-5.7.26-1.el7.x86_64
警告：mysql-community-client-5.7.26-1.el7.x86_64.rpm:header v3 dsa/sha1 signature，key id 5072e1f5:nokey
錯誤：失敗的依賴項：
mysql社區服務器（x86-64）>=5.7.9是mysql-community-test-5.7.26-1.el7.x86_64所需要的
mysql-community-test-5.7.26-1.el7.x86_64需要perl（data:：dumper）
mysql-community-test-5.7.26-1.el7.x86_64需要perl（json）
mysql-community-test-5.7.26-1.el7.x86_64需要perl（time:：hires）