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SQL LENGTH function - Get the Number of Characters In a String
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Postgres Length Functions With Practical Examples - CommandPrompt Inc.
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SQL-SERVER: how to get the maximum length of a variable of VARCHAR help - Database Administrators Stack Exchange
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Top SQL string functions in SQL Server 2017
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Introduction to SQL Server's Common String Functions - CodeProject
The Length Limitations of LEN()? – SQLServerCentral
SQL Query to Find Shortest & Longest String From a Column of a Table - GeeksforGeeks
sql - Is it faster to check if length = 0 than to compare it to an empty string? - Stack Overflow
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LEN function in MSSQL and it's equivalent in MySQL
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