diff --git a/SQL Performance Explained - Everything developers need to know about SQL performance (Markus Winand) (Z-Library).pdf b/SQL Performance Explained - Everything developers need to know about SQL performance (Markus Winand) (Z-Library).pdf new file mode 100644 index 0000000..6774daa Binary files /dev/null and b/SQL Performance Explained - Everything developers need to know about SQL performance (Markus Winand) (Z-Library).pdf differ