Summary of special processing statements of MySQL SQL statements (must read)

1. Update the entire table. If the value of a column in a row of data is empty, make it equal to the value of another column field.

UPDATE ot_tgbz set update_day=if(update_day is null,date,update_day);

2. Update the entire table. If a field is greater than 2, update them all to 2.

UPDATE ot_user set xingyun_num=if(xingyun_num > 2,2,xingyun_num);

3. Replace all the URLs containing https://www.jb51.net/ in the thumb field of the shop_goods table with empty ones.

update shop_goods set thumb= replace (thumb,'https://www.jb51.net/','') where thumb like '%https://www.jb51.net/%';

4. SQL statement multi-field where query

$map="CAST(
  `UE_account` AS CHAR CHARACTER
     SET utf8
  ) LIKE '%$data%'
  OR CAST(
    `UE_accName` AS CHAR CHARACTER
    SET utf8
  ) LIKE '%$data%'
  OR CAST(
    `UE_truename` AS CHAR CHARACTER
    SET utf8
  ) LIKE '%$data%'
  OR CAST(
    `UE_phone` AS CHAR CHARACTER
    SET utf8
  ) LIKE '%$data%'";

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