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代码笔记20260113(一)

  • 2026-01-30 06:41:27
代码笔记20260113(一)
一、
1、SQL应用场景1：判定某字段A中前2个字，每一个字都存在于字段B中。
INSTR(B,SUBSTR(A,1,1)) > 0 and INSTR(B,SUBSTR(A,2,1)) > 0
2、SQL应用场景2：取上月末数据日期。
last_day(date_add('month',-1,date(cyrrent_date())))
3、SQL应用场景3：substring_index函数。
substring_index(str,delim,count)
e.g:字段A格式为“1.1-基金”——substring_index(A,'-',1)——1.1
4、SQL应用场景4：datediff函数。
datediff(datepart,startdate,enddate)
datepart:year/month/day/hour..
二、
1、EXCEL应用场景1：textjoin用换行符做分割。
TEXTJOIN(CHAR(10),TRUE,A1:A2)
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  1. 请求信息 : 2026-02-08 20:50:32 HTTP/2.0 GET : https://f.mffb.com.cn/a/463114.html
  2. 运行时间 : 0.324741s [ 吞吐率：3.08req/s ] 内存消耗：4,624.85kb 文件加载：140
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=2e7bdaeb2a5af6e5db08724f194dfd6d
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  1. CONNECT:[ UseTime:0.001097s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001732s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.015540s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007731s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001505s ]
  6. SELECT * FROM `set` [ RunTime:0.003154s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001624s ]
  8. SELECT * FROM `article` WHERE `id` = 463114 LIMIT 1 [ RunTime:0.002583s ]
  9. UPDATE `article` SET `lasttime` = 1770555032 WHERE `id` = 463114 [ RunTime:0.024364s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000850s ]
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