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SELECT tmp#_seq.NEXTVAL
        INTO id_temp
        from DUAL;  È»ºó¿ÉÒÔÓÃid_temp
(2)PLS-00103: ³öÏÖ·ûºÅ ">"ÔÚÐèÒªÏÂÁÐ֮һʱ£º
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 IF (sum>0)
      THEN
   begin
         INSERT INTO emesp.tp_sn_production_log
              VALUES (r_serial_number, , id_temp);
         EXIT;
    end; 
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2. PL/SQL
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    2) Oracle¿Í»§¶Ë¹¤¾ß·ÃÎÊOracle·þÎñÆ÷µÄ²Ù×÷ÓïÑÔ;
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    2) Á¼ºÃµÄ¿ÉÒÆÖ²ÐÔ(²»¹ÜOracleÔËÐÐÔÚºÎÖÖ²Ù×÷ϵͳ);
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Virtual Columns in Oracle Database 11g

When queried, virtual columns appear to be normal table columns, but
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for defining a virtual column is listed below.
column_name [datatype] [GENERATED ALWAYS] AS (expression) [VIRTUAL]
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SQL ServerÖ®·Ö²¼Ê½ÊÂÎñ

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