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mysql - How to merge group queries on multiple tables and sort them by date?

At present, four different tables are queried separately to sum up the data of each day. Please tell me how to merge and query four different sets of data for each day. The first column is sorted by date and only takes the year, month and day {code...}. The final display result is required to be as ...

为情所困 2017-05-16 13:28:13

mysql optimization - How to design the index when there are order by and sum in mysql multi-table joint query?

If there is currently a SQL statement that requires a joint query between two tables and uses group by and order by, how to design an index better? The example is as follows: {Code...} In this example, there are both tables a and b. The joint query, the sum() function for the b table fields, and the...

为情所困 2017-06-15 09:21:07

How to sort query results according to fields of another table through chain operations in TP5

Specific situation: one user table and the other is a user level table. I query (select) the information of the user table and want to sort it according to the power field of the user level table. What I wrote myself is to query the records one by one through a for loop and then write them to In a t...

葫芦娃平衡盘 2018-04-19 16:50:01

Multiple updates in MySQL

I know you can insert multiple rows at once, is there a way to update multiple rows at once (like in one query) in MySQL? EDIT: For example I have the following NameidCol1Col2Row1161Row2223Row3395Row44168 I want to combine all the following updates into one query UPDATEtableSETCol1=1WHEREid=1;UPDATE...

P粉154798196 2024-03-25 16:21:20

php PDO replace anonymous parameter ('?') in query with editable value

I'd like a way to show what a SQL query looks like when replacing anonymous parameters (?) with actual parameters. This is for readability purposes and debugging only and will not be used as an actual query. I found this function works in most cases: returnarray_reduce($this->bindValues,function(...

P粉654894952 2023-09-02 11:38:14

Firestore method to get random documents in collection

It is crucial for my application to be able to randomly select multiple documents from a collection in Firebase. Since there is no built-in native function in Firebase (that I know of) to implement a query that does this, my first thought was to use a query cursor to pick a random starting and endin...

P粉277305212 2023-10-19 11:39:22

Why is DESC command query slow on MariaDB

I have a query running against Maridb, when we query in ASC order, the optimizer checks less number of records (r_rows) and completes the query in about 500 ms, but when switching the order to DESC, the same query It takes more time to complete, r_rows is about 2.27 million. Why is this? Why does AS...

P粉127901279 2024-02-03 21:29:17

Alias definition of Trait function in magic method __callStatic

I have a Queryable trait implemented using the __callStatic method, which creates a new Builder instance and runs the called function on it if it exists. It returns a Builder for chaining queries (similar to Eloquent). Now I'm trying to implement an interface that requires a find() function, but I'm...

P粉226642568 2023-07-31 11:46:23

How to receive and collect a passed object from another function in JavaScript?

I have a function, let's call it GetData(). I get the data from a query in another function and run an ajax call to populate the data. Once this operation is complete, I send the data to another function, let's call it PlaceData(). Each ajax call to GetData() puts the data in an object. I then send ...

P粉413704245 2023-09-15 13:12:20

Get the Props type from the component and omit the properties in it

I'm developing a TypeScript function for a React "higher-order component". Requires: A component, the ReactQuery useQuery type function returns the parameter array and is passed to the above useQuery type function optional resultKey, which determines whether the query results should be pro...

P粉704066087 2024-01-16 12:55:57

How to display single SQL query results in PHP

I have a query about this php code and can't display the results in echo, can I convert to string? //conexion is my function that connects to the database and is completed $costTotal=conexion();$costTotal=$costTotal->query("SELECTSUM(product_cost)FROMproduct");echo$costTotal;For example...

P粉852578075 2023-08-17 20:30:29

Set the value of the column matching ID in the same table to NULL

I'm working with housing data with multiple columns. During the cleaning process, I noticed that there are some Null values in the "PropertyAddress" column, and I wanted to confirm if these Null values can be matched with the ParcelID. Therefore, I wrote the following query to confirm ...

P粉463811100 2024-01-10 17:12:11

Subquery - how mysql merges multiple rows of data into multiple columns of one row

The picture shows the data I filtered out. The statement is select time,wish_num,num from wish_num where time >= '15296000' and time <= '1495382399' group by time,wish_num, time and wish_num are joint primary keys. Now I hope Put the same date in...

習慣沉默 2017-05-24 11:33:01

Ask an idiot question

The random function rand() generates ten random integers between (-10,10) and saves them in the arr1 array. Query whether there is a random integer 0 among the ten random integers generated in array arr1. If yes, output "the ten random integers generated this time contain the random number 0&qu...

 蒹葭苍苍 2017-09-13 14:15:44

How to optimize a SQL query with over 2 million rows

I have a Sql database with over 2 million rows and it is growing rapidly. There aren't many columns, just code, price, date, and stationID. The purpose is to get the latest price by code and stationID. The query works great but takes over 10 seconds. Is there any way to optimize the query? $statemen...

P粉127901279 2023-09-01 18:09:31

Problem filtering data from a dataset based on user input

Here's an overview of what I've tried so far: I have a searchInput element where the user can enter their search query. I use a function to handle the filtering process when the value of searchInput changes. The filter function loops through the dataset and compares each item to the value of searchI...

P粉903969231 2023-09-20 09:37:52

Save post metadata for SQL query results when using "woocommerce_thankyou" hook

I'm trying to query a database and pass the results to the update_post_meta function. But not sure if I'm building this correctly or if there's something wrong with my $order_id usage? Once an order is placed, I need to update the post meta with the currently logged in user and the query results for...

P粉080643975 2024-03-31 21:34:04

MySQL - Simple query sometimes suffers from infinite loop and increasing number of rows_fetched

I've been trying to figure out for the past 4 weeks why queries are executing intermittently forever on DockerMysqlPerconaDistribution (percona:8.0.32-24, empty my.cnf). This postscript query is run after importing multiple CSVs generated using MySQLShell's data mining algorithm. Half of the time, i...

P粉022140576 2023-09-08 09:20:56

python - How can I optimize the speed of pandas' read_sql?

My needs require data query and correlation between multiple databases, so I chose to use pandas, read the data through read_sql and process it into the dataframe to directly generate the target data. But we are currently encountering a problem: read_sql is very slow. For example, reading 37...

淡淡烟草味 2017-06-28 09:22:30

Static image service implementation - PHP, JS and HTML technology

Good morning. I know nothing about HTML, CSS, PHP or HTML but for some reason I managed to put together a website. The website queries a mysql database, loads Google Maps, and displays a marker on the queried address. I have correctly written the Python code to scrape the data, and the data in the S...

P粉990568283 2023-08-13 14:24:45