1.Basic Loop 2. FORLoop 3.WHILE Loop 下面来逐一介绍这三种循环的用法。 一、BasicLoops 基本循环的格式如下: LOOP statement1; ... EXIT [WHENcondition]; END LOOP; 这里的EXIT是用来退出循环的,如果没有EXIT,则会变成死循环。 下面来看一个小例子: SQL>select location_id, city, country_idfromlocati...
get_time; dbms_output.put_line('v_end_time :'||v_end_time); dbms_output.put_line('duration of the forall statement '||(v_end_time - v_start_time)); select count(*) into v_total from test; dbms_output.put_line(v_total||' rows insterted'); commit;end;/v_start_time :449982...
*/ FOR counter IN REVERSE lower_bound..upper_bound LOOP statement1; statement2; . . . END LOOP; 代码演示: --数据内容和FOR循环例子一模一样,唯独不同是新增的数据empno展示顺序不同, --反向FOR循环 [REVERSE] 数据从大到小排序展示。 SET serveroutput ON SET verify OFF DECLARE v_empno emp_pl...
如果語句是 SELECT 語句,可能會傳回部分結果或沒有傳回結果。 傳回的任何部分結果可能不會包含遞歸層級上超過指定最大遞歸層級的所有數據列。 如需詳細資訊,請參閱 WITH common_table_expression。 NO_PERFORMANCE_SPOOL 適用於:SQL Server(從 SQL Server 2016 (13.x)開始)和 Azure SQL Database。 防止多任務...
using是可选的 FETCH my_cur INTO v_name, v_salary; --获取数据 WHILE my_cur%FOUND LOOP ...
WHILE TRUE LOOP INSERT INTO target_table (column1, column2) SELECT column1, column2FROMsource_table LIMIT batch_size OFFSET offset; IF NOT FOUND THEN EXIT; END IF; COMMIT; -- 每批提交一次事务 offset := offset + batch_size; END LOOP; ...
SELECT @n = @n + 1 IF @n > 52BREAKELSECONTINUEPRINT ‘I Never get executed’ END The reason is either the BREAK statement force an EXIT, or when the CONTINUE is run, the loop is reset to the beginning of the block. While Statement – Dig Deeper: ...
下面我以sql server 2008 R2,数据库是Northwind数据库为例, 目标:把Northwind数据库的Orders表导出成insert语句。 第一步:选择Northwind数据库,右键-任务-生成脚本: 第二步:在弹出的“生成和发布脚本”的简介窗口,按“下一步”按钮: 第三步:在“选择对象”窗口,选中“选择特定数据库对象”,展开表, ...
SQL database in Microsoft Fabric Sets a condition for the repeated execution of a SQL statement or statement block. The statements are executed repeatedly as long as the specified condition is true. The execution of statements in theWHILEloop can be controlled from inside the loop with theBREAK...
SQL Server supports Transport Layer Security (TLS) 1.2 for highly secure communications. The Tabular Data Stream (TDS) protocol is also used to protect communications over untrusted networks. Encryption in use on the client To protect personal data while in use, “Always Encrypted...