INNER JOIN Person.EmailAddress AS EA ON BEA.BusinessEntityID = EA. INNER JOIN Person.Address AS A ON BEA.AddressID = A.AddressID SELECT TOP 10 City, STRING_AGG(CONVERT(NVARCHAR(max), EmailAddress), ' ') WITHIN GROUP (ORDER BY EmailAddress ASC) AS Emails Similar to the previous example, the following query finds the email addresses of employees, groups them by city, and sorts the emails alphabetically: USE AdventureWorks2019 Generate a sorted list of emails per towns returned in the emails column can be directly used to send emails to group of people working in some particular cities. STRING_AGG is available in any compatibility level. To return a place holder for null values, use the ISNULL function as demonstrated in example B. Null values are ignored and the corresponding separator is not added. Copy column C:D, then paste special as value ( Alt E - S - V - Enter ). IF (A2<>A1, B2, C1 & ',' & B2) Identify useful rows by entering into D2 A2<>A3 and copy down to D3:D10.If the input expression is type VARCHAR, the separator cannot be type NVARCHAR. Prepare data in comma-separated format in column C by entering into C2 the following formula and copy down to C3:C10. Data can be imported into a PM table from a CSV (comma separated values) file. For more information about data type conversions, see CAST and CONVERT (Transact-SQL). The data in PM tables is stored in the MySQL database wf.The implicit conversion to strings follows the existing rules for data type conversions. Expression values are implicitly converted to string types and then concatenated. STRING_AGG is an aggregate function that takes all expressions from rows and concatenates them into a single string. Int, bigint, smallint, tinyint, numeric, float, real, bit, decimal, smallmoney, money, datetime, datetime2, The following table lists automatic conversions: Input expression type If input argument is string type ( NVARCHAR, VARCHAR), result type will be same as input type. Return type depends on first argument (expression). Only one order_by_expression is allowed per query. Optionally specify order of concatenated results using WITHIN GROUP clause: WITHIN GROUP ( ORDER BY )Ī list of non-constant expressions that can be used for sorting results. Is an expression of NVARCHAR or VARCHAR type that is used as separator for concatenated strings. Non-string types are converted to NVARCHAR type. Expressions are converted to NVARCHAR or VARCHAR types during concatenation. Regards guys.To view Transact-SQL syntax for SQL Server 2014 and earlier, see Previous versions documentation. Where table_schema = 'db2' and table_name = 'table2' ) as i2Īnd the obvious result is dob that is present in table1 and not in table2. Where table_schema = 'db1' and table_name = 'table1' ) as i1 Id int not null auto_increment primary key, I add an example of two different databases on the same server. As you said your problem was quite different because it concerned with different servers. Here's an example of how to use FINDINSET () to join two tables: SELECT FROM table1 INNER JOIN table2 ON FINDINSET (table1.id, table2. This function searches for a value within a comma-separated list. So, you can even compare fields between tables with a left join for example.Įdit. To join two tables using a comma-separated list in the join field, you can use the FINDINSET () function in MySQL. Information schema allows you to make queries on metadata. Where table_schema = 'database_name' and table_name = 'table_name'Įdit. Take a look at the information_lumns table select group_concat(column_name order by ordinal_position) The results are a list of any columns that exist in the first database and not in the second. WHERE table_schema = 'db_name' AND table_name = 'tbl_name' AND column_name NOT IN ('id', 'name', 'field1', 'field2') Then I can use this query to compare: SELECT GROUP_CONCAT(column_name ORDER BY ordinal_position) That gives me a list that looks like this: 'id', 'name', 'field1', 'field2' WHERE table_schema = 'db_name' AND table_name = 'tbl_name' Thanks for the answers, guys! Applying your answers to the question, this is my final SQL to get the column names: SELECT CONCAT("'", GROUP_CONCAT(column_name ORDER BY ordinal_position SEPARATOR "', '"), "'") AS columns What I am after is a comma-delimited list that I can then take to the live server and do: SHOW COLUMNS FROM table_name WHERE NOT IN ()Īny thoughts on how best to do this - either by correcting me in my own approach, or by another means all together? Obviously, the above SQL does not work.Ī note: The servers are entirely separate and may not communicate with each other, so no direct comparison is possible. I'd like to do something like this: SELECT GROUP_CONCAT(Field) FROM (SHOW COLUMNS ON table_name) GROUP BY Field I am comparing database tables on a development server against a live server, looking for column name changes, new columns, and columns that have been dropped.
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