MySQL: fetching a null or an empty string -
I know that a NULL value and an empty string ( "" ) value, but if I want to get a value using the keyword or , then I can not find any results for NULL value
is. I want to ask that the table looks like this:
titles_and_tags + ---- + ---------- + ------ + | ID | Title | Tag | + ---- + ---------- + ------ + | 1 | Title 1 Faucet | 2 | Heading 2 | Tag 1 | | 3 | Title 3 Tag 2 | | 4 | Edit | Faucet | 5 | Roudata | Div | + ---- + ---------- + ------ + The use of my query looks like this:
Select <name> * by selecting the name <title> "and" Tag "=" Tag 1 "or" Tag ") * Select * by name </code> </pre> <p> So I get one here Do the rows (id: 1,2), but this result is 0 rows. What have I done? </p> <p> <strong> Edit </strong> </p> <p> Sorry, I Forgotten that my main problem is: </p> <pre> <code> select 'Titles_and_tags` from WHERE' title 'such as "title%" and "tag` =" tag1 " '%' Like 'tag' </code> </pre> <p> then it is more like a closed subject, sorry </p> </div> <p> <div class = "post-text" choose itemprop = "text"> <p> Try </p> <pre> <code> heading * and tags with the title 'WHERE' * </code> </pre> <p> You have a wildcard <code>% < Except "code" and left your <code> "" "heading"% "and (` tag` = "tag1" or "tags" such as </code>, and you enter <code> or </code> should be included in the clause for clarity and clearly to ensure that it is fair with your intention Have been committed, group together logic together. </p> <p> <strong> Edit: </strong> Your edit will match the <code> tag '%' such as </code> all the rows that do not have the tag <code> null </code>. A <code> null </code> value is incorrect with <em> any </em> </code> or <code> is not </code> other than <em> <code> I'm not sure that you What are you trying to do with the last question, but I suspect that the question you asked for was originally what you really want. </P> </div> </html> <br /> <script data-cfasync='false' type='text/javascript' src='//p257699.clksite.com/adServe/banners?tid=257699_495604_10&type=footer&size=37'></script> <script data-cfasync='false' type='text/javascript' src='//p257699.clksite.com/adServe/banners?tid=257699_495604_11&tagid=9'></script> <script type="text/javascript" src="//ylx-1.com/slider.php?section=General&pub=435796&ga=g&side=random"></script> </div> <div class='post-bottom'> <div class='post-footer float-container'> <div class='post-footer-line post-footer-line-1'> </div> <div class='post-footer-line post-footer-line-2'> </div> <div class='post-footer-line post-footer-line-3'> </div> </div> <div class='post-share-buttons 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