How to intercept the first few bits of a string in sql

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Sql intercepts the first few bits of a string

In sql, you can fetch the first few bits of a string by using the LEFT function.

LEFT (c, number_of_char) is used to return the left part of a requested text field, where c represents the requested text field and number_of_cha represents the number of string digits to be fetched. For example, "LEFT (" www.php.cn ", 3)" can get the string "www".

Extended data:

In sql, common functions are described as follows:

1. AVG (): returns the average value

2. COUNT (): returns the number of rows

3. FIRST (): returns the value of the first record

4. LAST (): returns the value of the last record

5. MAX (): returns the maximum value

6. MIN (): returns the minimum value

7. SUM (): returns the sum

8. UCASE (): converts a field to uppercase

9. LCASE (): converts a field to lowercase

10. MID (): extract characters from a text field

11. LEN (): returns the length of a text field

12. ROUND (): rounds a numeric field to the specified number of decimal places

13. NOW (): returns the current system date and time

14. FORMAT (): formats how a field is displayed

15. INSTR (): returns the numeric position of the specified character in a text field

16. LEFT (): returns the left part of a requested text field

17. RIGHT (): returns the right side of a requested text field

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