oracle query contains

Oracle query inclusion is a syntax commonly used in Oracle database, which allows us to find rows containing specific data when querying data. Specifically, if we need to find rows that contain a specific character, string, or data, we can use Oracle query include syntax to accomplish this task.

In Oracle, query inclusion syntax is usually implemented using the LIKE operator and wildcard characters. The LIKE operator is used to match specific characters or patterns contained in a string, while wildcards are used to match specific types of characters or patterns. Specifically, the commonly used wildcard characters in Oracle include the following:

• % - used to match strings of any length.
• _ - used to match a single character.
• [ ] - used to match any one of a set of characters.
• [^ ] - used to indicate that it does not match any one of a set of characters.

The following is a simple example that demonstrates how to use query include syntax in Oracle to find rows containing specific characters:

SELECT *
FROM table_name
WHERE column_name LIKE '%search_string%';

In the above syntax, table_name is the The table name of the query, column_name is the column name to be searched, and search_string is the specific character or string to be searched. Use the % wildcard character to indicate that the character or string can appear anywhere in the column, that is, it can match characters or strings contained in other strings.

If we want to find lines that contain specific words or phrases, we can use the following syntax:

SELECT *
FROM table_name
WHERE column_name LIKE '%word1 word2%';

word1 and word2 in this syntax are the two words or phrases we want to find, Separate them with a space. When executing this query, Oracle looks for any rows that contain these two words or phrases and returns their results.

In addition to the LIKE operator, we can also use the CONTAINS function to perform query inclusion operations. The CONTAINS function is more useful than the LIKE operator when querying for contains because it performs full-text searches more efficiently and supports more powerful query capabilities. To use the CONTAINS function to query contains, we need to first create a table based on the full-text index, and then use the following syntax to execute the query:

SELECT *
FROM indexed_table_name
WHERE CONTAINS(column_name, 'search_string') > 0;

In this syntax, indexed_table_name is the table name based on the full-text index, column_name is the name of the column that contains the full-text index, and search_string is the specific string or phrase to find. If the CONTAINS function returns a result greater than 0, the string or phrase you are looking for is contained.

When using the CONTAINS function, we can also use some options and parameters to control the behavior of the query, such as specifying search parameters, excluding specific characters, and specifying query modes. To learn more about the syntax and usage of Oracle query inclusion operations, please refer to Oracle official documentation or other related materials.

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