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This article mainly introduces how to use the WHERE clause in SQLite, which has a certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article.

WHERE clause in SQLite

The WHERE clause is used to filter rows from the worksheet generated by the FROM clause. It provides an expression to judge each line. This line is discarded when the value returned by the expression is false or NULL. This discarding only deletes the record and will not be treated as an error. Therefore, the resulting table filtered by the WHERE clause will have the same number of columns as the original table, but may have fewer rows. Figure 3.10 shows how the WHERE clause works.

Figure 3.10 how the WHERE clause works

[example 3-3] below we will use the WHERE clause to filter the output of records with scores greater than 60 in the Students table. The corresponding SQL statement is as follows:

SELECT * FROM Students WHERE Score > 60

Run the program and execute it as shown in figure 3.11.

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