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Pattern matching is a versatile way of identifying character data. In SQL, the LIKE keyword is used to search for patterns. Pattern matching employs wildcard characters to match different combinations of characters.
The LIKE keyword indicates that the following character string is a matching pattern. LIKE is used with character data.
The syntax for LIKE is:
expression [ NOT ] LIKE match-expression
The expression to be matched is compared to a match-expression that can include these special symbols:
|%||Matches any string of 0 or more characters|
|_||Matches any one character|
The specifier in the brackets may take the following forms:
Note that the range [a-f], and the sets [abcdef] and [fcbdae] return the same set of values.
|[^specifier]||The caret symbol (^) preceding a specifier indicates non-inclusion. [^a-f] means not in the range a-f; [^a2bR] means not a, 2, b, or R.|
You can match the column data to constants, variables, or other columns that contain the wildcard characters displayed in the table. When using constants, you should enclose the match strings and character strings in single quotes.
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