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  • 1920.154s 0.309s 30817

    MyISAM HASH  restart-buffer

     1 CREATE TEMPORARY TABLE wtmp AS SELECT * FROM grab_sales_rank_month WHERE grab_year = 1627;
     2 UPDATE wtmp SET grab_year=1628;
     3 UPDATE grab_sales_rank_month wt LEFT JOIN wtmp ON wtmp.autoid=wt.autoid SET wt.grab_year=1629;
     4 SELECT * FROM grab_sales_rank_month; 
     5 
     6 [SQL]CREATE TEMPORARY TABLE wtmp AS SELECT * FROM grab_sales_rank_month WHERE grab_year = 1627;
     7 受影响的行: 0
     8 时间: 0.002s
     9 
    10 [SQL]
    11 UPDATE wtmp SET grab_year=1628;
    12 受影响的行: 0
    13 时间: 0.000s
    14 
    15 [SQL]
    16 UPDATE grab_sales_rank_month wt LEFT JOIN wtmp ON wtmp.autoid=wt.autoid SET wt.grab_year=1629;
    17 受影响的行: 30817
    18 时间: 0.309s
    19 
    20 [SQL]
    21 SELECT * FROM grab_sales_rank_month;
    22 受影响的行: 0
    23 时间: 0.021s
     1 CREATE TEMPORARY TABLE wtmp AS SELECT * FROM grab_sales_rank_month WHERE grab_year = 2016;
     2 UPDATE wtmp SET grab_year=1616;
     3 UPDATE grab_sales_rank_month wt SET grab_year=(SELECT grab_year FROM wtmp  WHERE autoid=wt.autoid);
     4 SELECT * FROM grab_sales_rank_month;
     5 
     6 [SQL]CREATE TEMPORARY TABLE wtmp AS SELECT * FROM grab_sales_rank_month WHERE grab_year = 2016;
     7 受影响的行: 25953
     8 时间: 0.090s
     9 
    10 [SQL]
    11 UPDATE wtmp SET grab_year=1616;
    12 受影响的行: 25953
    13 时间: 0.147s
    14 
    15 [SQL]
    16 UPDATE grab_sales_rank_month wt SET grab_year=(SELECT grab_year FROM wtmp  WHERE autoid=wt.autoid);
    17 受影响的行: 30817
    18 时间: 1920.154s
    19 
    20 [SQL]
    21 SELECT * FROM grab_sales_rank_month;
    22 受影响的行: 0
    23 时间: 0.023s
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  • 原文地址:https://www.cnblogs.com/rsapaper/p/6235844.html
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