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21 lis 2009 · select table_name, table_rows. from information_schema.tables. where. table_schema='databasename' and. table_name in ('user_table','cat_table','course_table') If you have InnoDB you have to query with count () as the reported value in information_schema.tables is wrong. answered Feb 13, 2010 at 9:37.
18 gru 2023 · You can refer to each WITH statement multiple times in another WITH statement or in a main query. In our example, we referenced the first defined WITH (the country_export_by_product CTE) in two places: In the second WITH (the country_export_total CTE) and in the main query.
13 gru 2019 · SELECT INC.[RecTime],INC.[SQL] AS [str] FROM. (. SELECT A.[RecTime] As [RecTime],X.[SQL] As [SQL] FROM [EventView] AS A. CROSS JOIN [Incident] AS X. WHERE. patindex('%' + A.[Col] + '%', X.[SQL]) > 0.
6 dni temu · 3.1. In the SELECT Clause. First, we’ll take a look at an example with the Student and Exam tables, in which we’ll retrieve each student’s name and the number of exams they’ve taken: SELECT s.name, (SELECT COUNT (*) FROM Exam e WHERE e.student_id = s.id) AS exam_count FROM Student s;
28 lut 2023 · One of the best ways to learn advanced SQL is by studying example queries. In this article, we'll show 25 examples of advanced SQL queries from medium to high complexity. You can use them to refresh your knowledge of advanced SQL or to review before a SQL interview.
30 mar 2017 · Table of Contents. How to Organize SQL Queries. Tip 1: Indent Your Code. Tip 2: Use the WITH Clause. Tip 3: Explain Yourself with Comments. Tip 4: Break Queries into Steps. Tip 5: Stick with One Naming Convention. The Mysterious Long SQL Query – Summary.
19 gru 2022 · These tips can help you write SQL queries that are more readable: Use meaningful and descriptive names for tables, columns, and aliases. Use white space and indentation to make the structure of your queries more clear. Use comments to document your queries and explain your reasoning.
