In sql structured query language, like the statement it has a vital role.
statement is syntax like: SELECT * from table where field name like the corresponding value (substring), it is primarily for the character field, its role is to retrieve a character column contains the corresponding field substring.
A:% any string of zero or more characters:
1, like'Mc% 'searches for all strings that begin with the letters Mc (e.g. McBadden).
2, like '% inger' searches for all strings that ends with inger (e.g. Ringer, Stringer).
3, like '% en%' searches for all strings that contain the letters en anywhere (e.g., Bennet, Green, McBadden).
B: _ (underscore) Any single character:
like'_heryl 'will search for all six-letter names ending with the letter heryl (such as Cheryl, Sheryl).
C: [] specified range ([AF]), or any single character set ([abcdef]) of:
1, like '[CK] ars [eo] n' will search for the following string: Carsen, Karsen, Carson and Karson (such as Carson).
2, like '[MZ] inger' searches for all names ending string inger, any single letter M to Z from the beginning (e.g., Ringer).
D: [^] does not belong to the specified range ([AF]) or set ([abcdef]) any single character:
like'M [^ c]% 'The search starts with the letter M, and the second letter of all names not c (e.g. MacFeather).
E: * It is different from the DOS command wildcard for multiple characters:
