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DBMS_OUTPUT.PUT_LINEが表示されない

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DBMS_OUTPUT.PUT_LINEを表示するには、以下を事前に実行しておく必要があります。

SET SERVEROUTPUT ON

例:

SET SERVEROUTPUT ON;
BEGIN
  DBMS_OUTPUT.PUT_LINE('HELLO WORLD');
END;

参考:

環境:

SELECT * FROM v$version;
BANNER BANNER_FULL BANNER_LEGACY CON_ID
Oracle Database 21c Express Edition Release 21.0.0.0.0 - Production Oracle Database 21c Express Edition Release 21.0.0.0.0 - Production
Version 21.3.0.0.0
Oracle Database 21c Express Edition Release 21.0.0.0.0 - Production 0
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