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  • DB2sql——insert all与insert first用法讲解与实例

    1、建测试表 
     
    
        CREATE TABLE EDW_INT   
        (   
          AGMT_NO         VARCHAR2(40 BYTE)             NOT NULL,   
          AGMT_SUB_NO     VARCHAR2(4 BYTE)              NOT NULL,   
          NEED_REPAY_INT  NUMBER(22,2),   
          CURR_PERIOD     NUMBER(4)                     NOT NULL   
        );   
        CREATE TABLE EDW_INT_1   
        (   
          AGMT_NO         VARCHAR2(40 BYTE)             NOT NULL,   
          AGMT_SUB_NO     VARCHAR2(4 BYTE)              NOT NULL,   
          NEED_REPAY_INT  NUMBER(22,2),   
          CURR_PERIOD     NUMBER(4)                     NOT NULL   
        );   
        CREATE TABLE EDW_INT_2   
        (   
          AGMT_NO         VARCHAR2(40 BYTE)             NOT NULL,   
          AGMT_SUB_NO     VARCHAR2(4 BYTE)              NOT NULL,   
          NEED_REPAY_INT  NUMBER(22,2),   
          CURR_PERIOD     NUMBER(4)                     NOT NULL   
        );  
    
    
    2、插入测试数据 
     
    
        INSERT INTO EDW_INT   
          (AGMT_NO, AGMT_SUB_NO, NEED_REPAY_INT, CURR_PERIOD)   
        VALUES   
          ('20003874', '2104', 3126.5, 7);   
        INSERT INTO EDW_INT   
          (AGMT_NO, AGMT_SUB_NO, NEED_REPAY_INT, CURR_PERIOD)   
        VALUES   
          ('20003874', '2104', 3290.76, 6);   
        INSERT INTO EDW_INT   
          (AGMT_NO, AGMT_SUB_NO, NEED_REPAY_INT, CURR_PERIOD)   
        VALUES   
          ('20003874', '2104', 3454.06, 5);   
        INSERT INTO EDW_INT   
          (AGMT_NO, AGMT_SUB_NO, NEED_REPAY_INT, CURR_PERIOD)   
        VALUES   
          ('20003874', '2104', 3616.41, 4);   
        INSERT INTO EDW_INT   
          (AGMT_NO, AGMT_SUB_NO, NEED_REPAY_INT, CURR_PERIOD)   
        VALUES   
          ('20017143', '2104', 2350.86, 0);   
        INSERT INTO EDW_INT   
          (AGMT_NO, AGMT_SUB_NO, NEED_REPAY_INT, CURR_PERIOD)   
        VALUES   
          ('20017143', '2104', 3566.55, 0);   
        INSERT INTO EDW_INT   
          (AGMT_NO, AGMT_SUB_NO, NEED_REPAY_INT, CURR_PERIOD)   
        VALUES   
          ('20018273', '2104', 1639.46, 0);   
        INSERT INTO EDW_INT   
          (AGMT_NO, AGMT_SUB_NO, NEED_REPAY_INT, CURR_PERIOD)   
        VALUES   
          ('20018273', '2104', 2080.49, 0);   
        COMMIT;  
    
    
    3insert all/first语句示例
    
    (1)、insert all-不带条件 
     
    
        insert all   
        into edw_int_1(agmt_no,agmt_sub_no,need_repay_int,curr_period)   
        values(agmt_no,agmt_sub_no,need_repay_int,curr_period)   
        into edw_int_2(agmt_no,agmt_sub_no,curr_period)   
        values(agmt_no,'1234',curr_period)   
        select agmt_no,agmt_sub_no,need_repay_int,curr_period from edw_int;   
        commit;  
    
    
    (2)、insert all-带条件 
     
    
        insert all   
        when curr_period=0 then    
        into edw_int_1(agmt_no,agmt_sub_no,need_repay_int,curr_period)   
        values(agmt_no,agmt_sub_no,need_repay_int,curr_period)   
        else  
        into edw_int_2(agmt_no,agmt_sub_no,need_repay_int,curr_period)   
        values(agmt_no,agmt_sub_no,need_repay_int,curr_period)   
        select agmt_no,agmt_sub_no,need_repay_int,curr_period from edw_int;   
        commit;  
    
    
    (3)、insert first-带条件 
     
    
        insert first   
        when curr_period=0 then    
        into edw_int_1(agmt_no,agmt_sub_no,need_repay_int,curr_period)   
        values(agmt_no,agmt_sub_no,need_repay_int,curr_period)   
        when agmt_sub_no='2104' then   
        into edw_int_2(agmt_no,agmt_sub_no,need_repay_int,curr_period)   
        values(agmt_no,agmt_sub_no,need_repay_int,curr_period)   
        select agmt_no,agmt_sub_no,need_repay_int,curr_period from edw_int;   
        commit;  
    
    
    4、数据结果查看 
     
    
        truncate table edw_int_1;   
        truncate table edw_int_2;   
        select * from edw_int;   
        select * from edw_int_1;   
        select * from edw_int_2;  
    
    
    5、all与first的区别
    
    all:不考虑先后关系,只要满足条件,就全部插入;
    
    first:考虑先后关系,如果有数据满足第一个when条件又满足第二个when条件,则执行第一个then插入语句,第二个then就不插入第一个then已经插入过的数据了。
    
    其区别也可描述为,all只要满足条件,可能会作重复插入;first首先要满足条件,然后筛选,不做重复插入。
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  • 原文地址:https://www.cnblogs.com/wy20110919/p/9299342.html
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