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如图一: Connection to 127.0.0.1:54321 refused.Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connctions. 我的电脑-- 阅读全文
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--循环DECLARE CURSOR c_cursor is SELECT 需要循环的值 FROM 表名; 变量 表名.需要循环的值的类型 %type ; i NUMBER;begin open c_cursor ; loop fetch c_cursor into 变量; exit when c_ 阅读全文
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--创建索引DECLARE NUM NUMBER;BEGIN SELECT COUNT(*) INTO NUM FROM USER_INDEXES WHERE TABLE_NAME='表名' AND INDEX_NAME='新添加的索引的名称'; IF NUM=0 THEN EXECUTE IMME 阅读全文
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--增加字段DECLARE N NUMBER;BEGIN SELECT COUNT(1) INTO N FROM USER_TAB_COLUMNS WHERE TABLE_NAME = upper('表名') AND COLUMN_NAME = upper('增加的字段名'); IF N = 0 T 阅读全文
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--创建表DECLARE NUM NUMBER;BEGIN SELECT COUNT(1) INTO NUM FROM USER_TABLES WHERE TABLE_NAME=UPPER('表名'); IF NUM>0 THEN EXECUTE IMMEDIATE 'DROP TABLE 表名'; 阅读全文
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1.插入语句 INSERT WHEN (NOT EXISTS(SELECT * FROM 表名 WHERE 字段='xxx')) THEN INTO 表名("字段1","字段2","字段3","字段4","字段5") VALUES ('值1', '值2', '值3', '值4', '值5',)SEL 阅读全文