Maximum Length of an SQL Query

Maximum size for a SQL Server Query? IN clause? Is there a Better Approach

Every SQL batch has to fit in the Batch Size Limit: 65,536 * Network Packet Size.

Other than that, your query is limited by runtime conditions. It will usually run out of stack size because x IN (a,b,c) is nothing but x=a OR x=b OR x=c which creates an expression tree similar to x=a OR (x=b OR (x=c)), so it gets very deep with a large number of OR. SQL 7 would hit a SO at about 10k values in the IN, but nowdays stacks are much deeper (because of x64), so it can go pretty deep.

Update

You already found Erland's article on the topic of passing lists/arrays to SQL Server. With SQL 2008 you also have Table Valued Parameters which allow you to pass an entire DataTable as a single table type parameter and join on it.

XML and XPath is another viable solution:

SELECT ...
FROM Table
JOIN (
   SELECT x.value(N'.',N'uniqueidentifier') as guid
   FROM @values.nodes(N'/guids/guid') t(x)) as guids
 ON Table.guid = guids.guid;

Retrieve the maximum length of a VARCHAR column in SQL Server

Use the built-in functions for length and max on the description column:

SELECT MAX(LEN(DESC)) FROM table_name;

Note that if your table is very large, there can be performance issues.

Maximum length of an SQL Query

The maximum length of a query that PostgreSQL can process is 2147483648 characters (signed 4-byte integer; see src/include/lib/stringinfo.h).

Maximum Length of a SQL Query in Oracle

The Oracle Documentation of the Database Limits does not specifiy an exact limit for the length of a SQL query. (Note that the number of lines is not revelant, but the total length of the query string.

There is only this Note there

The limit on how long a SQL statement can be depends on many factors, including database configuration, disk space, and memory

You can be sure there is no such 4000 character (as for VARCHAR2) limit there and 500+ line query is not unusual.

You will have a hard work to write a query that cross the length limit.

More "realistic" is that you cross some other limitation such as the 255 subqueries in the WHERE clause.

Check the link provided above for Oracle 19 for the full list of the limitations.

So far more important to check the propper length od the query is this test:

review the query after 14 days and if it is well readable and understandable - it has a right length!

Maximum Length of a SQL Query in Microsoft Access 2010?

The help file says that the maximum number of characters in a SQL statement
is approximately 64,000. It doesn't mention any difference between pass
through queries and other queries, so in the absence of any specific
documentation I'm assuming that this also applies to pass through queries.

Sql Query throws Identifier is too long. Maximum length is 128

Use single quotes and escape your quotes in the text with two single quotes:

update dbo.DataSettings set
set Query= '/Details?$filter=(Status ne ''yes'' and Status ne ''ok'')&$expand=name,Address/street,phone/mobile&$orderby=details/Id desc'
where id=5

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