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如何从期权交易中获利

在 IQ Option 上交易三角形模式的指南

For rate and section control of sprayers, anhydrous toolbars and 在 IQ Option 上交易三角形模式的指南 liquid toolbars, choose the Field-IQ ISOBUS Liquid Control System. This ISO-compatible application control system offers an intuitive and easy-to-use run screen, making it 在 IQ Option 上交易三角形模式的指南 easy to set up and operate.

Modify Select So Only The First One Is Gray

I have a select element and am using the 在 IQ Option 上交易三角形模式的指南 first option as the title of the select field. I am 在 IQ Option 上交易三角形模式的指南 wondering if there is a way to gray out the text inside the select field when the first option is selected. Can this 在 IQ Option 上交易三角形模式的指南 only be done in JS, or is there a CSS solution?

I have tried changing the style of the first option but that only changes the colour of the text when I activate the dropdown menu.

5 Answers 5

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Here is a more modern solution so it'在 IQ Option 上交易三角形模式的指南 s not specific to the first option, but rather an invalid 在 IQ Option 上交易三角形模式的指南 option and requires no JS to show only the title/placeholder option as grey whereas the rest appear normal.

The :invalid selector on the select only works on an option if the select box is required, 在 IQ Option 上交易三角形模式的指南 and the selected option's value is empty, so you can style it as you would a text box's placeholder text.在 IQ Option 上交易三角形模式的指南 在 IQ Option 上交易三角形模式的指南

Setting it to disabled prevents the user from selecting it in the 在 IQ Option 上交易三角形模式的指南 select options, and setting it to hidden hides it from the select options.

Here is my CodePen demo that explores additional select box styles and shows this one in action on a light background.

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MySql Soft delete

I just got a new requirement where I need to delete some records from one of main entity. I 在 IQ Option 上交易三角形模式的指南 dont want to apply hard delete here as its risky for whole 在 IQ Option 上交易三角形模式的指南 application. If I use soft delete I have to add another field is_deleted and because of that i have to update all my queries (like where is_deleted = '0').

Please let me know if there is any smarter way to handle this situation. I have to make changes in half of the queries if I introduce a new flag to handle deletes.

Yes, as per your requirement flag 在 IQ Option 上交易三角形模式的指南 is best choice, othervise you can take a abstract of your table into temporary table and done delete on it for checking.

Depends what you mean by soft delete and what the risks are for the application. You could create a new table for "deleted" entries 在 IQ Option 上交易三角形模式的指南 and move "soft-deleted" across.

2 Answers 2

Trending sort

Trending sort is based off 在 IQ Option 上交易三角形模式的指南 of the default sorting method — by highest score — but it boosts votes that have happened recently, helping to surface more up-to-date answers.

It falls back to sorting by highest score if no posts are trending.

Switch to Trending sort

Your application can run without any 在 IQ Option 上交易三角形模式的指南 changes. MySQL is ANSI-SPARC Architecture compliant . With external schema you achieve codd's rule 9 "Logical data independence":

Changes to the logical level (tables, columns, rows, and so on) must not require a change to an application based on the structure. Logical data independence is more difficult to achieve than physical data independence.

You can rename 在 IQ Option 上交易三角形模式的指南 在 IQ Option 上交易三角形模式的指南 your tables and create views with original table names. A sample:在 IQ Option 上交易三角形模式的指南

Let's supose a table named my_data :

Another way is create a trigger and make a copy of erased rows in independent table.

Instead of using a bit called is_deleted , use a dateTime called something like deleted_Date . have this value be NULL if it is still active, and be a timestamp for the deletion date otherwise. This 在 IQ Option 上交易三角形模式的指南 way you also know when a particular record was deleted.

Instead of 在 IQ Option 上交易三角形模式的指南 updating half of your queries to exclude deleted records, create a view that does this filtering, and then update your queries to use 在 IQ Option 上交易三角形模式的指南 this view instead of applying the filtering everywhere.

If the soft 在 IQ Option 上交易三角形模式的指南 deleted records are involved in any type of relationships, you may have to create triggers to ensure that active records can't have a parent that is flagged as deleted.

Think ahead to how you want to eventually hard-delete these soft-deleted records, and make sure that you have the appropriate integrity checks in place before performing the hard-delete.