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SQLiteLIKE operator is used to match a text value specified wildcard pattern.If the search expression and expression pattern matching, LIKE operator returns true (true), which is 1. There are two wildcards used with LIKE operator:
Percent (%)
An underscore (_)
Percent sign (%) represents zero, one or more digits or characters. An underscore (_) represents a single digit or character. These symbols can be used in combination.
% And _ The basic syntax is as follows:
SELECT FROM table_name WHERE column LIKE 'XXXX%' or SELECT FROM table_name WHERE column LIKE '% XXXX%' or SELECT FROM table_name WHERE column LIKE 'XXXX_' or SELECT FROM table_name WHERE column LIKE '_XXXX' or SELECT FROM table_name WHERE column LIKE '_XXXX_'
You can use the AND or OR operator to combine the N number of conditions. Here, XXXX can be any number or string value.
The following examples demonstrate the '%' and '_' operator different places with the LIKE clause:
语句 | 描述 |
---|---|
WHERE SALARY LIKE '200%' | 查找以 200 开头的任意值 |
WHERE SALARY LIKE '%200%' | 查找任意位置包含 200 的任意值 |
WHERE SALARY LIKE '_00%' | 查找第二位和第三位为 00 的任意值 |
WHERE SALARY LIKE '2_%_%' | 查找以 2 开头,且长度至少为 3 个字符的任意值 |
WHERE SALARY LIKE '%2' | 查找以 2 结尾的任意值 |
WHERE SALARY LIKE '_2%3' | 查找第二位为 2,且以 3 结尾的任意值 |
WHERE SALARY LIKE '2___3' | 查找长度为 5 位数,且以 2 开头以 3 结尾的任意值 |
Let's take a practical example, suppose COMPANY table has the following records:
ID NAME AGE ADDRESS SALARY ---------- ---------- ---------- ---------- ---------- 1 Paul 32 California 20000.0 2 Allen 25 Texas 15000.0 3 Teddy 23 Norway 20000.0 4 Mark 25 Rich-Mond 65000.0 5 David 27 Texas 85000.0 6 Kim 22 South-Hall 45000.0 7 James 24 Houston 10000.0
Here is an example, it shows the COMPANY table AGE 2 all records that begin with:
sqlite> SELECT * FROM COMPANY WHERE AGE LIKE '2%';
This produces the following results:
ID NAME AGE ADDRESS SALARY ---------- ---------- ---------- ---------- ---------- 2 Allen 25 Texas 15000.0 3 Teddy 23 Norway 20000.0 4 Mark 25 Rich-Mond 65000.0 5 David 27 Texas 85000.0 6 Kim 22 South-Hall 45000.0 7 James 24 Houston 10000.0
Here is an example, it displays the text COMPANY ADDRESS table contains a hyphen (-) all records:
sqlite> SELECT * FROM COMPANY WHERE ADDRESS LIKE '% -%';
This produces the following results:
ID NAME AGE ADDRESS SALARY ---------- ---------- ---------- ---------- ---------- 4 Mark 25 Rich-Mond 65000.0 6 Kim 22 South-Hall 45000.0