問題描述

sql如何查詢字段中有內(nèi)容的數(shù)據(jù)。 想統(tǒng)計(jì)都有哪些用戶填了某個(gè)字段。求方法

問題解答

SELECT * FROM table_name WHERE column_name IS NOT NULL

或者

SELECT * FROM table_name WHERE column_name <> ’’

根據(jù)你的列類型和默認(rèn)值選擇。

# 字段默認(rèn)值為 NULL的情形 start# 判斷member表里user_name為空情況下的用戶數(shù)SELECT count(*) FROM member WHERE user_name IS NULL;# 判斷member表里user_name不為空情況下的用戶數(shù)SELECT count(*) FROM member WHERE user_name IS NOT NULL;# 字段默認(rèn)值為 NULL的情形 end# 字段默認(rèn)值為空字符串的情形 start# 判斷member表里user_name為空情況下的用戶數(shù)SELECT count(*) FROM member WHERE user_name = ’’;# 判斷member表里user_name不為空情況下的用戶數(shù)SELECT count(*) FROM member WHERE user_name <> ’’;# 字段默認(rèn)值為空字符串的情形 end回答3：

select * from table where XX is not null and XX<>’ ’

引號(hào)內(nèi)是有空格的，好評(píng)如潮的答案！