Unrecoverable – The Link Has Been Severed

SQL Server Authentication is utilized by DSN to designate the user ID. It then retrieves the connection retries count using various elements like the connection string keyword and attributes. The ODBC Driver for SQL Server on Windows offers two options to regulate the reconnect behavior, including the connection retry count. Question: Hi We are encountering […]

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Inserting Data into MySQL Database using SQL

Feedback Solution 1: The values keyword is not utilized by Mysql. Insert into table_a (field1, field2) Select field1, field2 from table_b where table_b.ID = 10; Solution 2: In oracle and mysql: insert into test select 1 from dual The phrase “insert into table values” should not be used. Frequently Asked Questions

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Merge two tables into a single table

To create a new table, there are two options: either have one row per message where the recipients are concatenated in a single column, or have multiple rows per message if there are multiple recipients (with one recipient per row). To achieve this, the following SQL query can be used: SELECT t1.A, t1.B, t1.C, t2.D, […]

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Joining a One-to-Many Relationship: A Guide

Assuming that Bill is a member of groups A, B, and C, and we obtain a set from our subquery that includes Group A, Bill should be included in the result set alongside groups A, B, and C. To simplify the process, we can use the following approach to retrieve all the groups that individuals […]

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Joining Arrays in Postgres Using Inner Join

To filter out unwanted rows and columns and only retrieve records that meet a specific condition, the PostgreSQL Inner Join is utilized. This can be achieved through two syntaxes: the PostgreSQL Inner Join with the USING clause and the PostgreSQL Inner Join with the WHERE clause. To join Table A with Table B, we need […]

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Assigning Null Values in SQL: A Guide

Feedback Solution 1: In situations where the table has no rows and the use of count(*) or other aggregate function is not possible, this general example, along with others, will still provide a return value. SELECT data_length FROM all_tab_cols WHERE owner = ‘YOU’ AND table_name = ‘EMP’ AND column_name = ‘ENAMES’ UNION ALL SELECT -1 […]

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Breaking down a single row into several rows with SQL

Feedback Question: In an attempt to produce multiple rows from single row , I have successfully utilized the SQL provided. However, I am curious if there exists a more concise method to write this SQL since the current version is quite lengthy and may not be practical for live situations. Thank you. Although my query […]

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Enabling quoted identifier for SQL Server

In the past, SQL Server allowed interchangeable use of quotation marks and apostrophes for strings. However, ANSI introduced new guidelines stating that apostrophes should be used for strings, while quotation marks should be used for funky names. Square brackets are not a concern. Therefore, to quote a funky column or table name, you must use […]

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SQL count(*) performance

In Azure, the performance of index and table scans is negatively impacted. To improve this, a ‘useless’ addition to the query can force an index seek on the clustered index. When using nonclustered indexes, it’s beneficial to consider using them for columns with a high number of distinct values, such as a combination of first […]

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