查询1:下面的SELECT查询在上述的Student_Grade表中使用了FIND_IN_SET函数,并使用了First_City、Second_City、New_City列: SELECTFirst_City,Second_City,New_CityFIND_IN_SET('Ghaziabad',First_City,Second_City,New_City)ASGhaziabad_FindinsetFROMStudent_Grade; SQL Copy 这个SQL语句显示了Ghaziabad市在表格的三...
MySQLFIND_IN_SET()Function ❮Previous❮ MySQL FunctionsNext❯ ExampleGet your own SQL Server Search for "q" within the list of strings: SELECTFIND_IN_SET("q","s,q,l"); Try it Yourself » Definition and Usage The FIND_IN_SET() function returns the position of a string within ...
>db.user.find({$where:function(){return this.sex == 'nan';}}) {"_id" : 6, "sex" : "nan" } >db.user.find({$where:function(){return obj.sex == 'nan';}}) {"_id" : 6, "sex" : "nan" } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 以上代码...
Learn the syntax of the find\_in\_set function of the SQL language in Databricks SQL and Databricks Runtime.
在一次项目开发过程中,遇到了从数据库中获取父子关系链路的问题,当时使用了FIND_IN_SET函数去解决这个问题,解决函数如下: DELIMITER$$DROPFUNCTIONIFEXISTSgetParentList$$CREATEFUNCTION`getParentList`(rootIdBIGINT)RETURNSvarchar(1000)CHARSETutf8BEGINDECLAREsParentListvarchar(1000);DECLAREsParentTempvarchar(1000);SETs...
CREATE OR REPLACE FUNCTION find_in_set(v_mem text, v_set text) RETURNS int AS $$ DECLARE v_index int = 0; v_array text[]; v_elem text; BEGIN v_array := string_to_array(v_set, ','); FOREACH v_elem IN ARRAY v_array LOOP v_index := v_index+1; IF v_elem = v_mem ...
mysql find_in_set 索引优化,写在前面:索引对查询的速度有着至关重要的影响,理解索引也是进行数据库性能调优的起点。考虑如下情况,假设数据库中一个表有10^6条记录,DBMS的页面大小为4K,并存储100条记录。如果没有索引,查询将对整个表进行扫描,最坏的情况下,如果所
],'user','policyNo','expiryDate'=>['attribute'=>'expiryDate','value'=>function ($model) { //使用函数来处理属性值return$model->FormatData($model->expiryDate); }] ,'insurance_online_id',//'create_time',['class'=>'yii\grid\ActionColumn','template'=>'{delete}' //这里可以设置只保留...
-- The following SQL query uses the FIND_IN_SET() function to find the position of the string 'ank' within a comma-separated list of strings. SELECT FIND_IN_SET('ank', 'b,ank,of,monk'); Explanation: This SQL query calls the FIND_IN_SET() function to search for the substring 'an...
oracle中没有FIND_IN_SET函数,oracle自定义实现FIND_IN_SET函数sql如下: --FIND_IN_SET函数CREATEORREPLACEFUNCTIONFIND_IN_SET(piv_str1VARCHAR2, piv_str2VARCHAR2, p_sepVARCHAR2:=',')RETURNNUMBERISl_idxNUMBER:=0;--用于计算piv_str2中分隔符的位置strVARCHAR2(500);--根据分隔符截取的子字符串piv_...