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mysql - 24 consecutive sql statements, check one by one, is it better to union all?

These 24 consecutive lines are similar, but the conditions are different, such as 9 o'clock to 10 o'clock, 10 ...

From [MySQLdiscussion group] 2017-06-08 11:03:29 0  3  970

mysql group by多個字段

{代碼...} {代碼...}

From [MySQLdiscussion group] 2017-04-17 15:07:43 0  5  970

多表刪除問題

輸入命令： SELECT a.goods_id,a.goods_name FROM tdb_goods AS a LEFT JOIN (SELECT goods_id,goods_name FROM tdb_goods ...

From [MySQLdiscussion group] 2016-12-21 18:01:39 0  2  969

Experiment with sorting after query limit

So this is my first question here, please forgive me if something is wrong. I'm trying to make a sort query ba...

From [MySQLdiscussion group] 2023-09-05 14:46:42 0  1  968

php - msyql4 characters

Original sql field information: koubei_desc text COMMENT 'Word of mouth description (optimal)' I want to modif...

From [MySQLdiscussion group] 2017-07-04 13:43:26 0  1  968

mysql - How to connect two select results in sql statement?

As shown in the figure, these two results are obtained from the select query. How to join them together?

From [MySQLdiscussion group] 2017-05-25 15:08:05 0  2  968

Does anyone have detailed tutorials on mysql5.7 installation?

I feel that installing nginx and php is relatively simple, but mysql is more troublesome. The official website...

From [MySQLdiscussion group] 2017-05-24 11:33:16 0  2  968

MySQL如何將常量與變量拼接?

要寫一個存儲過程，更新從參數(shù) 起始 到 結(jié)束 的全部列。比如，有列a1,a2,a3......,a20，存儲過程傳進start和end兩個參數(shù)分別為2和10要根據(jù)參數(shù)將a2,a3......,a10更新為1。我目前寫了一...

From [MySQLdiscussion group] 2017-04-17 13:43:30 0  1  968

mysql怎樣把一張表中的某些字段復(fù)制到另一張表中（這張表還未添加任何數(shù)據(jù)）？

mysql怎樣把一張表中的某些字段復(fù)制到另一張表中（這張表還未添加任何數(shù)據(jù)）？大神幫幫忙

From [MySQLdiscussion group] 2017-03-08 09:29:19 0  1  968

Looking for an answer: Can't access the virtual server?

I have downloaded mysql several times and it was accessible the first time but not after that.

From [MySQLdiscussion group] 2018-04-06 16:09:45 0  2  967

PHP inserts data into the MySQL database in a loop. How to determine whether each item is inserted successfully?

As title. {code...}

From [MySQLdiscussion group] 2017-06-30 09:53:58 0  6  967

[MySQL] How to store array appropriately?

In actual practice, sometimes it is appropriate to use an array to store the content of a field. For example, ...

From [MySQLdiscussion group] 2017-06-20 10:05:33 0  2  966

Record query under partial value conditions - SQL skill sharing

I have a table called zipcode which has a column called code. The Code column contains the prefix of the zip c...

From [MySQLdiscussion group] 2024-04-06 16:01:26 0  1  965

mysql - sql 不用group by 怎么求和

對uid 相同的記錄的money 求和 比如uid 387 的記錄 結(jié)果uid 金額 求和的金額387 2000.00 5000.00387 3000.00 5000.00 因為我需要記錄的明細(xì) 所有不能用group b...

From [MySQLdiscussion group] 2017-04-17 13:16:11 0  2  965

php - How to ensure data security when one operation requests multiple services?

An order operation to purchase goods. To simultaneously reduce user points, insert an order. In the same libra...

From [MySQLdiscussion group] 2017-05-25 15:08:18 0  3  964