1. 获取年的最后一位, 两位, 三位, 四位 select to_char(sysdate,’Y’) from dual; — 获取年的最后一位 select to_char(sysdate,’YY’) from dual; — 获取年的最后两位 select to_char(sysdate,’YYY’) from dual; — 获取年的最后三位 select to_char(sysdate,’YYYY’) from dual; — 获...
SQL Macros - Creating parameterised views This tutorial explains how to create a parameterized view using SQL Macros. The examples use the built-in sales history schema so there are no setup steps. Script Simple Explain Plan This script explains the plan for a query of the sh.sales and sh....
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6。current_date()返回当前会话时区中的当前日期 date_value:=current_date SQL> column sessiontimezone for a15 SQL> select sessiontimezone,current_date from dual; SESSIONTIMEZONE CURRENT_DA --- --- +08:00 13-11月-03 SQL> alter session set time_zone='-11:00' 2 / 会话已更改。 SQL> sel...
上月今天SQL> select to_char(add_months(sysdate,-1),’yyyy-MM-dd’) PreToday from dual;PRETODAY———-2005-05-213.上月首天SQL> select to_char(add_months(last_day(sysdate)+1,-2),’yyyy-MM-dd’) firstDay from dual;FIRSTDAY———-2005-05-014.按照每周进行统计SQL> select to_char...
SQL> select to_char(add_months(sysdate,-1),'yyyy-MM-dd') PreToday from dual; PRETODAY --- 2005-05-21 3.上月首天 SQL> select to_char(add_months(last_day(sysdate)+1,-2),'yyyy-MM-dd') firstDay from dual; FIRSTDAY --- 2005-...
SQL> declare 2 i int:=1; 3 begin 4 while i<=10 loop 5 insert into testloop values(i); 6 i:=i+1; 7 end loop; 8 end; 9 / 3.FOR循环 当使用基本循环或WHILE循环时,需要定义循环控制变量,并且循环控制变量不仅可以使用NUMBER类型,也可以使用其他数据类型。当使用FOR循环时,ORACLE会隐含定义循环...
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For more information, see the Common connection errors section. Before you run any connector operations, on your Oracle client, set the environment variable named ORA_NCHAR_LITERAL_REPLACE to TRUE. This setting enables NCHAR string literal replacement, which prevents data loss when string literals ...