How to use SQL statements to intercept strings in MySQL
This article will explain in detail how to use SQL statements to intercept strings in MySQL. The content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have some understanding of the relevant knowledge after reading this article.
1. Left (name,4) intercepts the four characters on the left
Column:
SELECT LEFT (201809 / 04)
Results: 2018
2. Right (name,2) intercepts the 2 characters on the right
SELECT RIGHT (February, 201809) month
Results: 09
3. SUBSTRING (name,5,3) intercepts name. This field only intercepts the following 3 characters from the fifth character.
SELECT SUBSTRING ('Chengdu financing Department', 5Pol 3)
Result: business department
4. SUBSTRING (name,3) intercepts the name field from the third character, followed by all the characters
SELECT SUBSTRING (Chengdu financing Department, 3)
Result: financing Division
5. SUBSTRING (name,-4) intercepts the fourth character position (reciprocal) of the name field from beginning to end.
SELECT SUBSTRING (Chengdu financing Department,-4)
Result: capital business department
6. SUBSTRING (name,-4Power2) intercepts the fourth character position (reciprocal) of the name field, and only intercepts the next two characters.
SELECT SUBSTRING ('Chengdu financing Department',-4jin2)
Result: capital management
Note: we notice that in the function substring (str,pos, len), pos can be negative, but len cannot be negative.
7. Substring_index ('www.baidu.com','.', 2) intercepts the second'.' All previous characters
SELECT substring_index ('www.baidu.com','. 2)
Results: www.baidu
8. Substring_index ('www.baidu.com','.',-2) intercepts all characters after the second'.'(reciprocal)
SELECT substring_index ('www.baidu.com','.'- 2)
Results: baidu.com
9. SUBSTR (name, 1, CHAR_LENGTH (name)-3) intercepts the name field and removes all the characters in the last three digits of the name field
SELECT SUBSTR (Chengdu financing Department, 1, CHAR_LENGTH (Chengdu financing Department)-3)
Result: Chengdu financing
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