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Course Intermediate 18792

Course Introduction：Python is a computer programming language and a dynamic, object-oriented scripting language. It was originally designed for writing automated scripts (shell). This course will lead you to manually develop a word query system from scratch using python3.6

PHP query development tutorial

Course Advanced 10237

Course Introduction：In this era of data explosion, how can we find what we want in the vast amount of data? How is this achieved? Next, you can learn PHP's fuzzy query technology together.

PHP fuzzy query technology video tutorial

Course Advanced 21302

Course Introduction：In this era of data explosion, how can we find what we want in the vast amount of data? How is this achieved? Next, you can learn PHP's fuzzy query technology together.

SQL optimization and troubleshooting (MySQL version)

Course Intermediate 4594

Course Introduction：MySQL installation and configuration under Linux, database logical layering, parsing process, index, detailed analysis of SQL execution plan, principles to avoid index failure, optimization cases, common optimization strategies, slow SQL troubleshooting, simulation of massive data, lock mechanism, MySQL under windows and linux Master-slave replication.

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Get the SQL query results for the second repeated column.

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2023-08-02 12:42:13

Pass array to SQL insert query using PHP

I have a SQL query to insert data without column names: $sql="INSERTINTOtest_tableVALUES(null,1,2,3)";if(mysqli_query($conn,$sql)){echo'success!';}else{ echo'failed!';} I want to insert 1,2,3 as an array, something like this: $data=[1,2,3];$sql="INSERTINTOt

2023-08-28 21:42:59

Execute all SQL queries in yii2 migration

I'm trying to do a migration that executes multiple queries on different tables simultaneously $sql='';$sql.="UPDATEcard_seriesSETCode=903WHEREID=1600;";$cardsSeries1600=CardList::find()->where (['seriesId'=>1600])->orderBy('ID');$cardNum=2;foreach(

2023-09-06 18:08:57

Use UNION in SQL to pivot data on two query results

I'm trying to get a pivot table of two query results from a MySql database Here is my SQL query: SELECT*FROM(SELECT'NotSpot'asNotSpot,SUM(builds.Duration)asDuration,DATE_FORMAT(builds.date,"%Y- %c-%d")asdateFROMbuildsJOINlabelsONbuilds.Labels_label_i

2024-04-03 19:32:52

How can PHP display SQL query results through an array? There are multiple query results, as shown in the figure.

How can PHP display SQL query results through an array? There are multiple query results, as shown in the figure. I want the $date in the echo in forsearch to be an array. Instead of using $date directly, output $date[start], $date[start], $date[goal], $date[airline], $date[flight-no] separately. ,$date[voyage],$date[transit_airport],$date[_45kg],$date[

2020-10-19 23:03:05

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How Does SQL Execute Queries and Subqueries?

Course Introduction：Execution Sequence of Queries and Sub-Queries in SQLUnderstanding the execution sequence of SQL queries and sub-queries is crucial for optimizing...

2024-12-20 comment 0 295

How Does a SQL Query Parser Determine the Execution Order of Queries and Subqueries?

Course Introduction：Query and Subquery Execution Sequence in SQLIn SQL, the execution sequence of queries and subqueries is a crucial factor in optimizing...

2024-12-21 comment 0 1020

How to View SQL Queries Executed by Django?

Course Introduction：Troubleshooting Django's SQL QueriesThis question investigates methods for viewing the SQL queries executed by Django during query...

2024-11-04 comment 0 1035

What are the sql query statements?

Course Introduction：SQL query statement: 1. View the table structure [SQL>DESC emp]; 2. Query all columns [SQL>SELECT * FROM emp]; 3. Query the specified columns; 4. Query the specified rows; 5. Use arithmetic expressions; 6 , use logical operation symbols.

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How Do SQL Engines Execute Queries and Subqueries: A Matter of Optimization?

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