设置当前的schema：
db2 => set schema db2admin
DB20000I The SQL command completed successfully.
DB20000I The SQL command completed successfully.
此时，命令中包含schema会报错：
db2 => rename table db2admin.test_tab to db2admin.test_tab1
DB21034E The command was processed as an SQL statement because it was not a
valid Command Line Processor command. During SQL processing it returned:
SQL0108N The name "test_tab1" has the wrong number of qualifiers.
SQLSTATE=42601
db2 => rename table db2admin.test_tab to db2admin.test_tab1
DB21034E The command was processed as an SQL statement because it was not a
valid Command Line Processor command. During SQL processing it returned:
SQL0108N The name "test_tab1" has the wrong number of qualifiers.
SQLSTATE=42601
去掉schema可以成功重命名：
db2 => rename table test_tab to test_tab1
DB20000I The SQL command completed successfully.
db2 => rename table test_tab to test_tab1
DB20000I The SQL command completed successfully.
最后
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