Final answer:
A database designer uses the 'L' character in an input mask to specify that the input must be a letter. This is part of creating constraints on user input for data integrity in database fields.
Step-by-step explanation:
In order to specify a character, a database designer can enter an input mask containing the L character. An input mask is a string of characters where each character position can require a specific type of input, such as a letter or number. The character L in an input mask typically requires an input to be a letter. While not related to the concept of a logographic system, in which a character represents a word or symbol, input masks in databases are a form of constraining user input to maintain data integrity and formatting.
In order to specify a character, a database designer can enter an input mask containing the wildcard character. This wildcard character is represented by the asterisk (*) symbol.If a database designer wants to search for all words starting with the letter 'A', they can use the input mask 'A*'. This mask will match any word that begins with 'A', followed by any sequence of characters.