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15 lip 2017 · You can use conditional aggregation to get all the info for a parentid on to one row and then use a where clause for the required condition. select * from (. select parentid. ,max(case when key='name' then value end) as name. ,max(case when key='age' then value end) as age.
The easy way of doing this, if you're using IDs from some internal, trusted data source, where you can be 100% certain they're integers (e.g., if you selected them from your database earlier) is this: $sql = 'SELECT * WHERE id IN (' . implode(',', $ids) . ')';
The MySQL WHERE Clause. The WHERE clause is used to filter records. It is used to extract only those records that fulfill a specified condition. WHERE Syntax. SELECT column1, column2, ... FROM table_name. WHERE condition; Note: The WHERE clause is not only used in . SELECT statements, it is also used in UPDATE, DELETE, etc.! Demo Database.
21 cze 2024 · The WHERE clause is used to specify a condition while fetching data from a single table or by joining multiple tables. Only the records that meet the specified condition are retrieved. Syntax: SELECT column1, column2, ... FROM table_name.
25 sty 2024 · This is where the WHERE clause comes in handy. It allows you to specify conditions to filter the rows returned by a SELECT statement. In this tutorial, we will delve deep into using WHERE clause in MySQL with a wide array of examples, progressing from basic to advanced applications.
5.6.7 Searching on Two Keys. An OR using a single key is well optimized, as is the handling of AND. The one tricky case is that of searching on two different keys combined with OR: SELECT field1_index, field2_index FROM test_table. WHERE field1_index = '1' OR field2_index = '1'. This case is optimized.
12 lut 2016 · For getting the result from the two table associated with the foreign key, you need to join the tables. Find below query as like you want the result: SELECT name, date, roll FROM A INNER JOIN B ON A.id = B.id;
