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: Tname is changedCreate or Replace Trigger TEA_TNAME_UPAfter--event is triggered beforeUpdate of Tname on teacher--action on the Tname column of the teacher table, or directly on the table, remove the row on the row directly on table--Do not write is statement-level, write for each row is row-levelBegin-what is triggered and doneSYS. Dbms_output. Put_Line (' tname is changed ');EndWhen updated: Update teacher Set tname = ' Pure rookie ' where tid=1;

return_expr2 whencomparison_exprn Then return_exprnELSE else_expr] END --Query the employee information for the department number 10,20,30, and if the department number is 10, print -1.1 times times its work, department 20th, 1.2 times times, 30th department, 1.3 times Times Select employee_id,last_name,department_id, case department_id when ten then salary*1.1 When salary*1.2 Else

then return_expr2When comparison_exprn then return_exprnELSE else_expr] END --Query the employee information for department number 10,20,30, and if the department number is 10, print--1.1 times times its work, department number 20th, 1.2 times times, 30th department, 1.3 times TimesSelect employee_id,last_name,department_id,Case DEPARTMENT_ID when ten then salary*1.1When salary*1.2else

allowable range of the trunk, if within the scope of the forwarding, otherwise discardedTrunk Port transmitter: Compare Port Pvid and will send message VLAN information if the two are equal then the VLAN information is stripped and sent, if not equal, sent directlyHybrid Port Ticker: received a message to determine if there is VLAN information: If not, hit the upper port PVID and Exchange forwarding. If any, determine whether the hybrid port allows the VLAN data to enter: if it can be forwarded

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