It is important for DBAs or DevOps to be able to tune and extend their production systems without interrupting service. Thus, we continue to ensure that MySQL is leading in this area. In 5.7 we have delivered th
MySQL 8.0 deliversNOWAITandSKIP LOCKEDalternatives in the SQL locking clause. Normally, when a row is locked due to anUPDATEor aSELECT ... FOR UPDATE, any other transaction will have to wait to access that locked row. In some use cases there is a need to either return immediately if a ...
Performance and scalability is a priority for MySQL, learning from community feedback and taking into account trends and developments in computer hardware and its architecture. So far in 5.7 we have delivered impressive read-only (RO) scalability results with InnoDB and significantly sped up the con...
isMan.eq(1)) .toSqlString() SQL .selectFrom(tUser) .allColumnsFrom(tUser) .where(tUser.isMan.eq(1)) .toSqlString() Using subqueries // Scalar subquery is used to return single value as a column. const scalarSub = SQL .uses(tUser) .selectFrom(tArticle) .columns(MAX(tArticle....
ADD and SUBTRACT depending on the condition is CASE STATEMENT ADD COLUMN to variable table? Add prefix in data column Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a large (100 million rows) table with default constraint adding a extra column in a pivot table created...
(cost=0.85 rows=6) -> Single-row index lookup on <subquery2> using <auto_distinct_key> (c2=t1.c1) -> Materialize with deduplication -> Filter: (t2.c2 is not null) (cost=0.85 rows=6) -> Table scan on t2 (cost=0.85 rows=6) Anti-join: mysql> EXPLAIN FORMAT=TREE SELECT * ...
When the Contains LINQ operator is used with a subquery, EF Core now generates better queries using SQL IN instead of EXISTS; aside from producing more readable SQL, in some cases this can result in dramatically faster queries. For example, consider the following LINQ query:...
MySQL - OR Operator MySQL - Like Operator MySQL - IN Operator MySQL - ANY Operator MySQL - EXISTS Operator MySQL - NOT Operator MySQL - NOT EQUAL Operator MySQL - IS NULL Operator MySQL - IS NOT NULL Operator MySQL - Between Operator MySQL - UNION Operator MySQL - UNION vs UNION ALL MyS...
1 row in set (0.00 sec) No Support ● CREATE TABLE – GLOBAL/LOCAL – ON COMMIT – REF IS – UNDER – AS SUBQUERY ● CREATE/ALTER/DROP SCHEMA – AUTHORIZATION No Support ● Catalogs – CATALOG fields in I_S are NULL – SET CATALOG not supported ...
1 row in set (0.00 sec) No Support ● CREATE TABLE – GLOBAL/LOCAL – ON COMMIT – REF IS – UNDER – AS SUBQUERY ● CREATE/ALTER/DROP SCHEMA – AUTHORIZATION No Support ● Catalogs – CATALOG fields in I_S are NULL – SET CATALOG not supported ...